tomasstolker/pycrires

Data reduction pipeline for VLT/CRIRES+

pycrires's Issues

obs_nodding and obs_nodding_irregular do not seem to behave well with multiple exposures per nod

I have been trying to reduce an ABBA sequence where each A and B nod consists of 5 exposures. So the sequence goes:
A,A,A,A,A,B,B,B,B,B, B,B,B,B,B,A,A,A,A,A, etc.

When using pipeline.obs_nodding, it takes exposure 5 (A) and exposure 6 (B) as a nodding pair. Exposures 1 to 4 and 7-10 are ignored entirely.

When using pipeline.obs_nodding_irregular, it starts by taking exposure 1 (A) and exposure 6 (B), which I think is the desired behaviour, and then continues with exposure 2 (A) and exposure 6 (B) again, and the remaining B exposures of the A-B pair are subsequently ignored.

I believe that a solution should ideally be at the level of obs_nodding (because this sequence is regular), in that it recognises the number of A and B frames in each nod pair correctly.

The desired behaviour is (probably) that it uses exposures 1 and 6, 2 and 7, 3 and 8, 4 and 9, 5 and 10, 11 and 16, 12 and 17, etc. as nod pairs. In the case of a time-series (which is my use case), the user can then use the individually extracted A and B exposures.