[daip] [Fwd: cross check DFTPL-IMAGR]

[Hanno Spreeuw]

Sorry, I just wanted to add that I did set CMETHOD='DFT' in IMAGR.

-------- Original Message --------
Subject: cross check DFTPL-IMAGR
Date: Wed, 07 Jan 2009 15:42:36 +0100
From: Hanno Spreeuw <J.N.Spreeuw at uva.nl>
To: daip at nrao.edu

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.