[daip] cross check DFTPL-IMAGR

[Hanno Spreeuw]

Hello, I am comparing the outputs of IMAGR and DFTPL for a residual 
dataset with one source in the center.
DFTPL (SHIFT=0) sums the real parts of the visibilities of all 
baselines, according to the helpfile. I guess this means the mean, but 
is it the weighted mean? If so, are the weights used as is?

I selected the smallest possible time intervals (one sampling) and I 
used natural weighting in IMAGR and NITER=0. The central pixel values 
from the dirty images do not agree exactly with the output from DFTPL.
Should there be an exact match between the central pixel values and the 
fluxes from DFTPL for some setting of adverbs in IMAGR? I tried 
UVWTFN='NO','NZ', 'NV' and 'NS'.

Thanks,
Hanno.