4.2.2 Derived data

As soon as the raw data are read, some additional quantities are derived and stored in the following attributes:

• Channel_Sep: separation between bolometers, computed from Array_Geo
• UT: universal time at each integration (not implemented yet).
• phase differences: for observations performed with wobbler switching, pairs of ON-OFF integrations are extracted from the Wobbler_Sta attribute, and the phase differences can be computed. The results are stored in the 3-dimensional arrays Data_Obs_p, Data_Bac_p, Data_Red_p, Data_Noi_p, Data_Flag_p, where the 1st dimension corresponds to integrations, the 2nd dimension means: 0 = phase diff, 1 = phase1, 2 = phase2, and the 3rd dimension corresponds to pixels. The following parameters are also computed, where the values associated with the phase difference is computed as the mean value of phase1 and phase2: LST_p, Az_p, El_p, Lon_p, Lat_p, UT_p.