*** This package contains the following products for EHT epoch 2021 at 230GHZ ***
antab/ --- ANTAB calibration tables.
plots/ --- Validation plots.
ancillary/ --- Ancillary files.
raw_md/EHT2021_230GHz/ --- Raw metadata files delivered from each participating station.
custom_antab.py --- Python script to produce customized ANTAB tables per track, per source.
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For further details on the contents of each folder, please refer to Koay et al. (2024a): https://eventhorizontelescope.org/sites/g/files/omnuum3116/files/eht/files/eht_memo_koay_2023-l1-01.pdf
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Additional notes & remaining issues:
1) APEX Tsys values in track e21e13 before 01:50 UTC and all scans in track e21b09 were observed with Wobbler on.
   The duty cycle was 50% and we have scaled up the Tsys* values correspondingly by a factor of 2.
2) APEX observed in linear polarisation instead of circular one in track e21b09. LCP corresponds to X and RCP to Y. Correct labels appear only in
   the ANTAB tables. Linear polarisation Tsys* were excluded when calculating values reported in the *median*.txt files found in the /ancillary folder.
3) During post-processing analysis, it was noted that Tsys values from APEX in track e21e13, band 4, might be swapped. This would
   mean that RCP values are LCP and vice-versa. The user may need to change the labels directly in the affected ANTAB tables.
4) The GLT did not provide Tsys values for track e21e13 owing to powermeter issues. We replaced NaN values by modelled ones using
   the approximation for Tsys* described in Koay et al. (2024a).
