= Reducing CABB Data =
== An example ==

This page will walk through the reduction process for the ToO observation CX167, which was observed on 16 Feb 2009 with the interim CABB system.
This system had 5 antenna dual pol, 1 IF at 6/3cm, but not all 2048 continuum channels were working.

'''First, make sure you have the CABB version of MIRIAD, otherwise this will not work! '''

To do this on `kaputar`, make sure that `/nfs/atapplic/miriad-cabb/linux64/bin` is in your path ahead of any other MIRIAD directories. To check that
this is so, in a terminal, type `which atlod`. It should return `/nfs/atapplic/miriad-cabb/linux64/bin/atlod`.

Then `source /nfs/atapplic/miriad-cabb/MIRRC`. You should now be using the CABB version of MIRIAD.

To begin with, the reduction is the same as any other pre-CABB dataset, and we start by using ATLOD to read in the data.
We have four files for CX167: `2009-02-16_0658.CX167`, `2009-02-16_0701.CX167`, `2009-02-16_1651.CX167` & `2009-02-16_1824.CX167`.

`atlod in=*.CX167 out=cx167.uv ifsel=2 options=birdie`

Here, we use `ifsel=2` because only 1 IF was available with the interim CABB system and it was written as IF 2.

At this point, we can see what the CABB spectrum looks like with uvspec:

`uvspec vis=cx167.uv "select=pol(xx,yy)" interval=10 options=nobase,avall axis=chan,amp device=/xs`

[[Image(cx167_example_plot1.png)]]

We obviously need to calibrate the bandpass. Luckily there is some 1934-638 data, so we calibrate our bandpass with that:

`mfcal vis=cx167.uv "select=source(1934-638)" interval=0.1`

Giving the same `uvspec` command as before we now get: