One difference is that it is generally desirable to load both
observing bands together, to allow joint calibration. A shortcoming of
Miriad is that it is poor at handling multiple observing bands
when the polarisation products differ between the bands. However
the standard ATCA correlator configurations that combine narrowband
and wideband observations generally do measure different polarisation
products in the two bands. As polarimetry
with the ATCA 3-mm system is not possible anyway, the simplest approach
to ensuring the polarisation products of the two bands are the same is by
discarding polarisation products that are not needed. The
atlod
option nopol
causes atlod
to discard any XY and YX
products.
Typical inputs to atlod are:
ATLOD | |
in=2006-02-18_1234.C123 | Input RPFITS file. |
out=vela.uv | Output Miriad dataset. |
options=nopol,birdie,reweight | Typical options used. |
The birdie
option for continuum data is
used to discard edge channels and every second channel:
for the continuum ATCA correlator configuration, successive channels are
not independent and so there is no sensitivity penalty in discarding
every second channel.
Miriad manager