change flag method and column name - #1
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(1) Create a copy of 'DATA' column as 'DATA_ori' column, to backup original data. Then directly write AAF-calibrated data into "DATA" column.
(2)In the previous version, flagged data were simply set into "np.nan", however CASA won't accept such values. Thus in this version, flagged data were set into zeros, and the corresponding values in FLAG column were changed into "True".
In conclusion, two columns were changed in the output MS:
"DATA": now stores AAF-calibrated data.
"FlAG": missing subbands and channel 0 of each subbands were flagged.
Add one more column into MS: "DATA_ori", which is a backup for original non-AAF-calibrated data.