Table C.2
Detailed overview and explanation of null test variables.
| Null variable | Explanation |
|---|---|
| ambt. . . . . . . . . . . . . . . . . . . . . | Ambient temperature at telescope site, as recorded by a nearby weather station. |
| wind. . . . . . . . . . . . . . . . . . . . . | Wind speed, as recorded by a nearby weather station. |
| wint. . . . . . . . . . . . . . . . . . . . . | Winter/summer split, the time difference to the middle of winter (15th of January). |
| half. . . . . . . . . . . . . . . . . . . . . | Half-mission split, early versus late scans. |
| odde. . . . . . . . . . . . . . . . . . . . . | Odd versus even scans. |
| dayn. . . . . . . . . . . . . . . . . . . . . | Day/night split, time difference to 2 AM. |
| dtmp. . . . . . . . . . . . . . . . . . . . . | Dew temperature, as recorded by a nearby weather station. |
| hmty. . . . . . . . . . . . . . . . . . . . . | Humidity, as recorded by a nearby weather station. |
| pres. . . . . . . . . . . . . . . . . . . . . | Air pressure, as recorded by a nearby weather station. |
| wthr. . . . . . . . . . . . . . . . . . . . . | Bad weather and cloud coverage, predicted by a neural network trained on the raw data. |
| sune. . . . . . . . . . . . . . . . . . . . . | Sun elevation. |
| modi. . . . . . . . . . . . . . . . . . . . . | Average angular distance from the center of the field to the moon during the scan. |
| sudi. . . . . . . . . . . . . . . . . . . . . | Average angular distance from the center of the field to the sun during the scan. |
| tsys. . . . . . . . . . . . . . . . . . . . . | Average system temperature, as measured by the vane calibration, during the scan. |
| fpo0. . . . . . . . . . . . . . . . . . . . . | fknee value of a 1 / f fit on the 0 th-order 1 / f gain fluctuation filter coefficient. (a) |
| fpol. . . . . . . . . . . . . . . . . . . . . | fknee value of a 1 / f fit on the 1 st-order 1 / f gain fluctuation filter coefficient. (a) |
| apo0. . . . . . . . . . . . . . . . . . . . . | α value of a 1 / f fit on the 0 th-order 1 / f gain fluctuation filter coefficient. (a) |
| apo1. . . . . . . . . . . . . . . . . . . . . | α value of a 1 / f fit on the 1 st-order 1 / f gain fluctuation filter coefficient. (a) |
| spo0. . . . . . . . . . . . . . . . . . . . . | σ0 value of a 1 / f fit on the 0 th-order 1 / f gain fluctuation filter coefficient. (a) |
| spo1. . . . . . . . . . . . . . . . . . . . . | σ0 value of a 1 / f fit on the 1 th-order 1 / f gain fluctuation filter coefficient. (a) |
| npca. . . . . . . . . . . . . . . . . . . . . | Number of PCA components subtracted in the TOD filtering pipeline. |
| pcaa. . . . . . . . . . . . . . . . . . . . . | Average amplitude of the fitted PCA components in the TOD filtering pipeline. |
| s01f. . . . . . . . . . . . . . . . . . . . . | σ0 value of a 1 / f fit on the sideband-averaged time-domain data. |
| fk1f. . . . . . . . . . . . . . . . . . . . . | fknee value of a 1 / f fit on the sideband-averaged time-domain data. |
| allf. . . . . . . . . . . . . . . . . . . . . | α value of a 1 / f fit on the sideband-averaged time-domain data. |
| azdr. . . . . . . . . . . . . . . . . . . . . | Scans split internally in left- vs right-moving pointing, in azimuth. |
Notes. Explanation of the null test split variables. For all variables, we show the abbreviation used in Table C.1 and a more detailed explanation of the null test variable (a) As part of the TOD filtering a first order polynomial is fitted across the frequency bands for each time-sample. The 0th- and 1st-order polynomial components (as functions of time) tend to follow a 1 / f spectrum, and a fit is performed on their TOD power spectra. See Lunde et al. (2024); Foss et al. (2022) for details.
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