THIS IS NOT FINANCIAL ADVICE Experimental; data and analysis may be wrong or delayed, so do not rely on this site to make financial decisions. Full disclaimer U.S. ECONOMY & MARKETS 27 Oct 2026 · 00:36 UTC
INDICATOR DETAIL
Monthly average Treasury ten-year minus three-month yield 0.9 percentage points
Valid Period ending 30 Sep 2026 Available 30 Sep 2026 · 22:27 UTC
Mean of paired daily Treasury constant-maturity par-yield differences for the completed month; context only.
Published metric history, percentage points 180 observed values from 2011-10-31 to 2026-09-30. Horizontal position follows economic dates. Lines stop at explicitly missing source periods. Recent exact values follow in the table; all retained readings are available through the pinned JSON query. -2 0 2 2011-10-31: 2.13 percentage points 2011-11-30: 2 percentage points 2011-12-31: 1.97 percentage points 2012-01-31: 1.93 percentage points 2012-02-29: 1.88 percentage points 2012-03-31: 2.09 percentage points 2012-04-30: 1.97 percentage points 2012-05-31: 1.71 percentage points 2012-06-30: 1.53 percentage points 2012-07-31: 1.43 percentage points 2012-08-31: 1.58 percentage points 2012-09-30: 1.62 percentage points 2012-10-31: 1.64 percentage points 2012-11-30: 1.56 percentage points 2012-12-31: 1.65 percentage points 2013-01-31: 1.84 percentage points 2013-02-28: 1.89 percentage points 2013-03-31: 1.87 percentage points 2013-04-30: 1.7 percentage points 2013-05-31: 1.88 percentage points 2013-06-30: 2.25 percentage points 2013-07-31: 2.55 percentage points 2013-08-31: 2.69 percentage points 2013-09-30: 2.79 percentage points 2013-10-31: 2.57 percentage points 2013-11-30: 2.65 percentage points 2013-12-31: 2.84 percentage points 2014-01-31: 2.81 percentage points 2014-02-28: 2.66 percentage points 2014-03-31: 2.67 percentage points 2014-04-30: 2.67 percentage points 2014-05-31: 2.53 percentage points 2014-06-30: 2.56 percentage points 2014-07-31: 2.52 percentage points 2014-08-31: 2.39 percentage points 2014-09-30: 2.51 percentage points 2014-10-31: 2.29 percentage points 2014-11-30: 2.3 percentage points 2014-12-31: 2.18 percentage points 2015-01-31: 1.85 percentage points 2015-02-28: 1.96 percentage points 2015-03-31: 2.02 percentage points 2015-04-30: 1.91 percentage points 2015-05-31: 2.18 percentage points 2015-06-30: 2.35 percentage points 2015-07-31: 2.29 percentage points 2015-08-31: 2.1 percentage points 2015-09-30: 2.15 percentage points 2015-10-31: 2.05 percentage points 2015-11-30: 2.14 percentage points 2015-12-31: 2.01 percentage points 2016-01-31: 1.83 percentage points 2016-02-29: 1.47 percentage points 2016-03-31: 1.59 percentage points 2016-04-30: 1.58 percentage points 2016-05-31: 1.53 percentage points 2016-06-30: 1.37 percentage points 2016-07-31: 1.2 percentage points 2016-08-31: 1.26 percentage points 2016-09-30: 1.34 percentage points 2016-10-31: 1.43 percentage points 2016-11-30: 1.69 percentage points 2016-12-31: 1.98 percentage points 2017-01-31: 1.91 percentage points 2017-02-28: 1.89 percentage points 2017-03-31: 1.73 percentage points 2017-04-30: 1.49 percentage points 2017-05-31: 1.4 percentage points 2017-06-30: 1.19 percentage points 2017-07-31: 1.23 percentage points 2017-08-31: 1.18 percentage points 2017-09-30: 1.16 percentage points 2017-10-31: 1.27 percentage points 2017-11-30: 1.1 percentage points 2017-12-31: 1.06 percentage points 2018-01-31: 1.15 percentage points 2018-02-28: 1.27 percentage points 2018-03-31: 1.12 percentage points 2018-04-30: 1.08 percentage points 2018-05-31: 1.08 percentage points 2018-06-30: 0.98 percentage points 2018-07-31: 0.89 percentage points 2018-08-31: 0.82 percentage points 2018-09-30: 0.84 percentage points 2018-10-31: 0.86 percentage points 2018-11-30: 0.74 percentage points 2018-12-31: 0.42 percentage points 2019-01-31: 0.29 percentage points 2019-02-28: 0.24 percentage points 2019-03-31: 0.12 percentage points 2019-04-30: 0.1 percentage points 2019-05-31: -0.01 percentage points 2019-06-30: -0.15 percentage points 2019-07-31: -0.09 percentage points 2019-08-31: -0.36 percentage points 2019-09-30: -0.24 percentage points 2019-10-31: 0.03 percentage points 2019-11-30: 0.24 percentage points 2019-12-31: 0.3 percentage points 2020-01-31: 0.21 percentage points 2020-02-29: -0.04 percentage points 2020-03-31: 0.57 percentage points 2020-04-30: 0.52 percentage points 2020-05-31: 0.55 percentage points 2020-06-30: 0.57 percentage points 2020-07-31: 0.5 percentage points 2020-08-31: 0.55 percentage points 2020-09-30: 0.57 percentage points 2020-10-31: 0.69 percentage points 2020-11-30: 0.78 percentage points 2020-12-31: 0.85 percentage points 2021-01-31: 1 percentage points 2021-02-28: 1.22 percentage points 2021-03-31: 1.58 percentage points 2021-04-30: 1.61 percentage points 2021-05-31: 1.6 percentage points 2021-06-30: 1.48 percentage points 2021-07-31: 1.27 percentage points 2021-08-31: 1.23 percentage points 2021-09-30: 1.33 percentage points 2021-10-31: 1.53 percentage points 2021-11-30: 1.51 percentage points 2021-12-31: 1.41 percentage points 2022-01-31: 1.62 percentage points 2022-02-28: 1.62 percentage points 2022-03-31: 1.68 percentage points 2022-04-30: 1.98 percentage points 2022-05-31: 1.91 percentage points 2022-06-30: 1.6 percentage points 2022-07-31: 0.6 percentage points 2022-08-31: 0.18 percentage points 2022-09-30: 0.3 percentage points 2022-10-31: 0.11 percentage points 2022-11-30: -0.43 percentage points 2022-12-31: -0.74 percentage points 2023-01-31: -1.16 percentage points 2023-02-28: -1.04 percentage points 2023-03-31: -1.2 percentage points 2023-04-30: -1.61 percentage points 2023-05-31: -1.73 percentage points 2023-06-30: -1.67 percentage points 2023-07-31: -1.59 percentage points 2023-08-31: -1.39 percentage points 2023-09-30: -1.18 percentage points 2023-10-31: -0.81 percentage points 2023-11-30: -1.02 percentage points 2023-12-31: -1.42 percentage points 2024-01-31: -1.4 percentage points 2024-02-29: -1.23 percentage points 2024-03-31: -1.26 percentage points 2024-04-30: -0.9 percentage points 2024-05-31: -0.97 percentage points 2024-06-30: -1.2 percentage points 2024-07-31: -1.18 percentage points 2024-08-31: -1.42 percentage points 2024-09-30: -1.2 percentage points 2024-10-31: -0.62 percentage points 2024-11-30: -0.26 percentage points 2024-12-31: 0 percentage points 2025-01-31: 0.29 percentage points 2025-02-28: 0.12 percentage points 2025-03-31: -0.06 percentage points 2025-04-30: -0.04 percentage points 2025-05-31: 0.06 percentage points 2025-06-30: -0.04 percentage points 2025-07-31: -0.02 percentage points 2025-08-31: -0.04 percentage points 2025-09-30: 0.05 percentage points 2025-10-31: 0.08 percentage points 2025-11-30: 0.16 percentage points 2025-12-31: 0.46 percentage points 2026-01-31: 0.55 percentage points 2026-02-28: 0.44 percentage points 2026-03-31: 0.53 percentage points 2026-04-30: 0.62 percentage points 2026-05-31: 0.8 percentage points 2026-06-30: 0.66 percentage points 2026-07-31: 0.73 percentage points 2026-08-31: 0.81 percentage points 2026-09-30: 0.9 percentage points 31 Oct 2011 16 Apr 2019 30 Sep 2026 Showing periods 254–433 of 433 in this date range. Each chart page contains at most 180 original periods; values are not downsampled. All retained snapshot-selected periods are available.
← Older periods Uses the data available in this saved assessment; later revisions may change historical values. This reconstructed chart does not show what was known on each historical date. Missing source periods break the line; unavailable metric values are omitted. Quality is evaluated at the assessment date.
Exact values · final 12 periods in this chart window Method, sources and timing Economic period & freshness Calculation uses the completed evaluation period. Source age and retrieval timing are separate from the value's economic period and availability. Source status uses configured economic-age thresholds, not a release calendar.
THE PUBLISHED TRANSFORM For identical daily dates in the completed month, average (long_yield percent minus short_yield percent); output percentage points.Context only: inversion has variable lead and cannot confirm contraction. Re-steepening is not automatically an all-clear. Direct Treasury components replace the prior FRED spread without asserting identical historical vintages. A minimum of 60 paired daily observations is required; this is an operational history floor, not a calibrated forecast.
Definition 5.0.0 · us_yield_curve_10y3m VALIDATION MATURITY Research informed The yield curve is policy and recession-expectation context with a variable lead.
Supplied research and Federal Reserve context.
Original Treasury CSV · 8022b43b26fb… ↗
Original Treasury CSV · d8d5e4bb7ae2… ↗
Original Treasury CSV · d52d81bd96f5… ↗
Original Treasury CSV · 13fb485ff708… ↗
Original Treasury CSV · c5482e2e88fa… ↗
Original Treasury CSV · cea2fce245f7… ↗
Showing 6 of 71 retained source files. All retained source file hashes (JSON) ↗
Original annual source files (CC0), including maturities outside this indicator. File hashes identify the exact retrieved bytes; these are not historical point-in-time vintages.
Chart source observations · 180 periods in this window Canonical source observations, % 180 observed values from 2026-02-09 to 2026-10-26. Horizontal position follows economic dates. Lines stop at explicitly missing source periods. Recent exact values follow in the table; all retained readings are available through the pinned JSON query. 4.0 4.5 5.0 2026-02-09: 4.22 % 2026-02-10: 4.16 % 2026-02-11: 4.18 % 2026-02-12: 4.09 % 2026-02-13: 4.04 % 2026-02-17: 4.05 % 2026-02-18: 4.09 % 2026-02-19: 4.08 % 2026-02-20: 4.08 % 2026-02-23: 4.03 % 2026-02-24: 4.04 % 2026-02-25: 4.05 % 2026-02-26: 4.02 % 2026-02-27: 3.97 % 2026-03-02: 4.05 % 2026-03-03: 4.06 % 2026-03-04: 4.09 % 2026-03-05: 4.13 % 2026-03-06: 4.15 % 2026-03-09: 4.12 % 2026-03-10: 4.15 % 2026-03-11: 4.21 % 2026-03-12: 4.27 % 2026-03-13: 4.28 % 2026-03-16: 4.23 % 2026-03-17: 4.2 % 2026-03-18: 4.26 % 2026-03-19: 4.25 % 2026-03-20: 4.39 % 2026-03-23: 4.34 % 2026-03-24: 4.39 % 2026-03-25: 4.33 % 2026-03-26: 4.42 % 2026-03-27: 4.44 % 2026-03-30: 4.35 % 2026-03-31: 4.3 % 2026-04-01: 4.33 % 2026-04-02: 4.31 % 2026-04-03: 4.35 % 2026-04-06: 4.34 % 2026-04-07: 4.33 % 2026-04-08: 4.29 % 2026-04-09: 4.29 % 2026-04-10: 4.31 % 2026-04-13: 4.3 % 2026-04-14: 4.26 % 2026-04-15: 4.29 % 2026-04-16: 4.32 % 2026-04-17: 4.26 % 2026-04-20: 4.26 % 2026-04-21: 4.3 % 2026-04-22: 4.3 % 2026-04-23: 4.34 % 2026-04-24: 4.31 % 2026-04-27: 4.35 % 2026-04-28: 4.36 % 2026-04-29: 4.42 % 2026-04-30: 4.4 % 2026-05-01: 4.39 % 2026-05-04: 4.45 % 2026-05-05: 4.43 % 2026-05-06: 4.36 % 2026-05-07: 4.41 % 2026-05-08: 4.38 % 2026-05-11: 4.42 % 2026-05-12: 4.46 % 2026-05-13: 4.46 % 2026-05-14: 4.47 % 2026-05-15: 4.59 % 2026-05-18: 4.61 % 2026-05-19: 4.67 % 2026-05-20: 4.57 % 2026-05-21: 4.57 % 2026-05-22: 4.56 % 2026-05-26: 4.5 % 2026-05-27: 4.48 % 2026-05-28: 4.45 % 2026-05-29: 4.45 % 2026-06-01: 4.47 % 2026-06-02: 4.46 % 2026-06-03: 4.49 % 2026-06-04: 4.47 % 2026-06-05: 4.55 % 2026-06-08: 4.56 % 2026-06-09: 4.53 % 2026-06-10: 4.55 % 2026-06-11: 4.45 % 2026-06-12: 4.48 % 2026-06-15: 4.47 % 2026-06-16: 4.43 % 2026-06-17: 4.49 % 2026-06-18: 4.46 % 2026-06-22: 4.51 % 2026-06-23: 4.5 % 2026-06-24: 4.41 % 2026-06-25: 4.4 % 2026-06-26: 4.38 % 2026-06-29: 4.38 % 2026-06-30: 4.44 % 2026-07-01: 4.48 % 2026-07-02: 4.49 % 2026-07-06: 4.48 % 2026-07-07: 4.55 % 2026-07-08: 4.56 % 2026-07-09: 4.54 % 2026-07-10: 4.56 % 2026-07-13: 4.62 % 2026-07-14: 4.58 % 2026-07-15: 4.55 % 2026-07-16: 4.57 % 2026-07-17: 4.55 % 2026-07-20: 4.6 % 2026-07-21: 4.63 % 2026-07-22: 4.67 % 2026-07-23: 4.71 % 2026-07-24: 4.69 % 2026-07-27: 4.65 % 2026-07-28: 4.61 % 2026-07-29: 4.67 % 2026-07-30: 4.68 % 2026-07-31: 4.75 % 2026-08-03: 4.7 % 2026-08-04: 4.63 % 2026-08-05: 4.63 % 2026-08-06: 4.69 % 2026-08-07: 4.65 % 2026-08-10: 4.72 % 2026-08-11: 4.7 % 2026-08-12: 4.68 % 2026-08-13: 4.63 % 2026-08-14: 4.68 % 2026-08-17: 4.72 % 2026-08-18: 4.71 % 2026-08-19: 4.65 % 2026-08-20: 4.69 % 2026-08-21: 4.74 % 2026-08-24: 4.7 % 2026-08-25: 4.64 % 2026-08-26: 4.66 % 2026-08-27: 4.67 % 2026-08-28: 4.73 % 2026-08-31: 4.75 % 2026-09-01: 4.79 % 2026-09-02: 4.79 % 2026-09-03: 4.77 % 2026-09-04: 4.78 % 2026-09-08: 4.8 % 2026-09-09: 4.83 % 2026-09-10: 4.95 % 2026-09-11: 4.96 % 2026-09-14: 4.97 % 2026-09-15: 5 % 2026-09-16: 5.01 % 2026-09-17: 4.94 % 2026-09-18: 5.01 % 2026-09-21: 4.96 % 2026-09-22: 4.96 % 2026-09-23: 5.11 % 2026-09-24: 5.18 % 2026-09-25: 5.17 % 2026-09-28: 5.24 % 2026-09-29: 5.26 % 2026-09-30: 5.29 % 2026-10-01: 5.24 % 2026-10-02: 5.28 % 2026-10-05: 5.31 % 2026-10-06: 5.27 % 2026-10-07: 5.28 % 2026-10-08: 5.22 % 2026-10-09: 5.24 % 2026-10-13: 5.21 % 2026-10-14: 5.19 % 2026-10-15: 5.1 % 2026-10-16: 5.09 % 2026-10-19: 5.15 % 2026-10-20: 5.12 % 2026-10-21: 5.13 % 2026-10-22: 4.96 % 2026-10-23: 5 % 2026-10-26: 5 % 09 Feb 2026 18 Jun 2026 26 Oct 2026 Showing periods 9,032–9,211 of 9,211 in this date range. Each chart page contains at most 180 original periods; values are not downsampled. All retained snapshot-selected periods are available.
← Older periods Uses snapshot-selected vintages. The final eight exact values in this window are tabulated above. The pinned JSON query provides all matching observations and provenance; follow its cursor for further pages.
Original Treasury CSV · 8022b43b26fb… ↗
Original Treasury CSV · d8d5e4bb7ae2… ↗
Original Treasury CSV · d52d81bd96f5… ↗
Original Treasury CSV · 13fb485ff708… ↗
Original Treasury CSV · c5482e2e88fa… ↗
Original Treasury CSV · cea2fce245f7… ↗
Showing 6 of 71 retained source files. All retained source file hashes (JSON) ↗
Original annual source files (CC0), including maturities outside this indicator. File hashes identify the exact retrieved bytes; these are not historical point-in-time vintages.
Chart source observations · 180 periods in this window Canonical source observations, % 180 observed values from 2026-02-09 to 2026-10-26. Horizontal position follows economic dates. Lines stop at explicitly missing source periods. Recent exact values follow in the table; all retained readings are available through the pinned JSON query. 3.6 3.8 4.0 4.2 2026-02-09: 3.69 % 2026-02-10: 3.69 % 2026-02-11: 3.7 % 2026-02-12: 3.7 % 2026-02-13: 3.68 % 2026-02-17: 3.69 % 2026-02-18: 3.7 % 2026-02-19: 3.69 % 2026-02-20: 3.69 % 2026-02-23: 3.69 % 2026-02-24: 3.69 % 2026-02-25: 3.69 % 2026-02-26: 3.68 % 2026-02-27: 3.67 % 2026-03-02: 3.72 % 2026-03-03: 3.71 % 2026-03-04: 3.71 % 2026-03-05: 3.7 % 2026-03-06: 3.69 % 2026-03-09: 3.71 % 2026-03-10: 3.71 % 2026-03-11: 3.71 % 2026-03-12: 3.72 % 2026-03-13: 3.72 % 2026-03-16: 3.72 % 2026-03-17: 3.72 % 2026-03-18: 3.73 % 2026-03-19: 3.73 % 2026-03-20: 3.74 % 2026-03-23: 3.74 % 2026-03-24: 3.74 % 2026-03-25: 3.73 % 2026-03-26: 3.73 % 2026-03-27: 3.73 % 2026-03-30: 3.71 % 2026-03-31: 3.7 % 2026-04-01: 3.7 % 2026-04-02: 3.7 % 2026-04-03: 3.71 % 2026-04-06: 3.72 % 2026-04-07: 3.71 % 2026-04-08: 3.69 % 2026-04-09: 3.68 % 2026-04-10: 3.69 % 2026-04-13: 3.71 % 2026-04-14: 3.71 % 2026-04-15: 3.71 % 2026-04-16: 3.7 % 2026-04-17: 3.7 % 2026-04-20: 3.71 % 2026-04-21: 3.69 % 2026-04-22: 3.69 % 2026-04-23: 3.69 % 2026-04-24: 3.69 % 2026-04-27: 3.68 % 2026-04-28: 3.68 % 2026-04-29: 3.68 % 2026-04-30: 3.68 % 2026-05-01: 3.68 % 2026-05-04: 3.7 % 2026-05-05: 3.69 % 2026-05-06: 3.69 % 2026-05-07: 3.69 % 2026-05-08: 3.69 % 2026-05-11: 3.7 % 2026-05-12: 3.7 % 2026-05-13: 3.69 % 2026-05-14: 3.69 % 2026-05-15: 3.69 % 2026-05-18: 3.68 % 2026-05-19: 3.67 % 2026-05-20: 3.65 % 2026-05-21: 3.68 % 2026-05-22: 3.68 % 2026-05-26: 3.68 % 2026-05-27: 3.68 % 2026-05-28: 3.69 % 2026-05-29: 3.69 % 2026-06-01: 3.78 % 2026-06-02: 3.77 % 2026-06-03: 3.78 % 2026-06-04: 3.78 % 2026-06-05: 3.78 % 2026-06-08: 3.8 % 2026-06-09: 3.79 % 2026-06-10: 3.79 % 2026-06-11: 3.78 % 2026-06-12: 3.78 % 2026-06-15: 3.79 % 2026-06-16: 3.79 % 2026-06-17: 3.83 % 2026-06-18: 3.83 % 2026-06-22: 3.85 % 2026-06-23: 3.85 % 2026-06-24: 3.85 % 2026-06-25: 3.84 % 2026-06-26: 3.83 % 2026-06-29: 3.87 % 2026-06-30: 3.87 % 2026-07-01: 3.85 % 2026-07-02: 3.82 % 2026-07-06: 3.87 % 2026-07-07: 3.86 % 2026-07-08: 3.87 % 2026-07-09: 3.83 % 2026-07-10: 3.85 % 2026-07-13: 3.89 % 2026-07-14: 3.84 % 2026-07-15: 3.83 % 2026-07-16: 3.84 % 2026-07-17: 3.85 % 2026-07-20: 3.86 % 2026-07-21: 3.87 % 2026-07-22: 3.89 % 2026-07-23: 3.95 % 2026-07-24: 3.96 % 2026-07-27: 3.96 % 2026-07-28: 3.9 % 2026-07-29: 3.83 % 2026-07-30: 3.82 % 2026-07-31: 3.83 % 2026-08-03: 3.91 % 2026-08-04: 3.89 % 2026-08-05: 3.89 % 2026-08-06: 3.9 % 2026-08-07: 3.87 % 2026-08-10: 3.89 % 2026-08-11: 3.89 % 2026-08-12: 3.87 % 2026-08-13: 3.87 % 2026-08-14: 3.86 % 2026-08-17: 3.87 % 2026-08-18: 3.86 % 2026-08-19: 3.86 % 2026-08-20: 3.87 % 2026-08-21: 3.88 % 2026-08-24: 3.87 % 2026-08-25: 3.86 % 2026-08-26: 3.85 % 2026-08-27: 3.84 % 2026-08-28: 3.9 % 2026-08-31: 3.91 % 2026-09-01: 3.92 % 2026-09-02: 3.92 % 2026-09-03: 3.89 % 2026-09-04: 3.91 % 2026-09-08: 3.94 % 2026-09-09: 3.95 % 2026-09-10: 4 % 2026-09-11: 4.07 % 2026-09-14: 4.11 % 2026-09-15: 4.11 % 2026-09-16: 4.14 % 2026-09-17: 4.12 % 2026-09-18: 4.14 % 2026-09-21: 4.17 % 2026-09-22: 4.16 % 2026-09-23: 4.19 % 2026-09-24: 4.24 % 2026-09-25: 4.24 % 2026-09-28: 4.28 % 2026-09-29: 4.25 % 2026-09-30: 4.2 % 2026-10-01: 4.17 % 2026-10-02: 4.19 % 2026-10-05: 4.22 % 2026-10-06: 4.21 % 2026-10-07: 4.22 % 2026-10-08: 4.23 % 2026-10-09: 4.25 % 2026-10-13: 4.26 % 2026-10-14: 4.28 % 2026-10-15: 4.28 % 2026-10-16: 4.26 % 2026-10-19: 4.27 % 2026-10-20: 4.26 % 2026-10-21: 4.25 % 2026-10-22: 4.22 % 2026-10-23: 4.22 % 2026-10-26: 4.22 % 09 Feb 2026 18 Jun 2026 26 Oct 2026 Showing periods 9,032–9,211 of 9,211 in this date range. Each chart page contains at most 180 original periods; values are not downsampled. All retained snapshot-selected periods are available.
← Older periods Uses snapshot-selected vintages. The final eight exact values in this window are tabulated above. The pinned JSON query provides all matching observations and provenance; follow its cursor for further pages.
Snapshot identity Snapshot ero_us_macro_financial_20261027T003609Z_3476e48f61e8 Profile version 11.0.0 Generated 27 Oct 2026 · 00:38 UTC Analytical content SHA-256 3476e48f61e89a392bf424594d533e4786040223a0d6bad7c1aa54e7ac1c3ce3 Source: U.S. Bureau of Labor Statistics. BLS.gov cannot vouch for the data or analyses derived from these data after the data have been retrieved from BLS.gov. Data access dates are supplied as retrieved_at in canonical observations. Latest retained BLS access: 03 Oct 2026 · 00:33 UTC. BLS source terms
Source: BIS debt service, credit and credit-gap statistics; debt service is model-based. ECO I's calculations and interpretation are its own; BIS does not endorse them. BIS statistical-use terms