Date: Tue, 3 Jun 2008 12:32:15 -0400
From: Peter Teuben <teuben@astro.umd.edu>
To: Vivien Chen <hchen@phys.nthu.edu.tw>
Cc: Jun-Hui Zhao <jzhao@cfa.harvard.edu>,
    ????????? Sheng-Yuan Liu <syliu@asiaa.sinica.edu.tw>
Subject: Re: missing sideband averages for uvwide in miriad4

Vivien:
  indeed, in miriad3 (following the BIMA convention) we did use the
first two channels as that special average. But with (many) spectral
windows and some of them different sizes, this really doesn't make
much sense anymore, and with CARMA/miriad4 we abandoned this.

If you do need those, they are easily constructed using a line=wide,2,....
but setting up a special start, step and width parameter, i think.

If you think we've missed the boat on something, we can see if this can
be resurrected, and added someplace else.
peter

On [Tue Jun 03 22:18], Vivien Chen wrote:
> Dear Peter and Jun-Hui:
>
> I just encountered a problem with uvwide in miriad4 that I think could
> be a bug.  My understanding for wideband channels is that the first
> two channels should be averages for lsb and usb, followed by averages
> for each individual windows.  However, the newly generated wideband
> channels appear to skip the averages for lsb and usb, namely wide,1,1
> and wide,1,2.  Instead, the two channels seem to become the averages
> of the first and second windows.  At the moment, the number of
> wideband channels, 2 plus number of windows, are correct but the last
> two wideband channels are just zeros.
>
> The version of uvwide in miriad3 works fine.
>
> Regards,
> Vivien
> --
> Assistant Professor
> Institute of Astronomy & Department of Physics
> National Tsing Hua University
> Hsinchu, Taiwan 30013
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