Sunday, May 27, 2007

WBR Step 4. One File per Each Day of Observations

Sometimes, your data is taken over multiple days. You want to calibrate each day separately. You can do this by setting 'timerang' in calib, but that scares me a little bit and has lots of room for mistakes. What I prefer to do is SPLIT off each day of observing, so that you'll have a UV file for each day of data. After you've calibrated each file individually, you can combine all the data back together using DBCON.

So how do you split your data according to observation day?

Using SPLIT!
Well, first of all, check in that scan list you got from LISTR to see what days you observed on.
Then run split with 'timerang' set to only include one of those days. For example, only include data taken on day 1:
timerang = 1 0 0 0 1 23 0 0
will include all data take on day 1 between 0 hr and 23 hr.

Everything else in SPLIT you will probably want to leave as default. Except for maybe 'outclass', which you could change to something like, say, 'line_1' (so that you remenber this is the line data from day 1).

SPLIT will generate a new UV file. You need to run INDXR on it to generate a new NX table. The defaults of INDXR are just fine for these purposes.

Unfortunately, you are going to have to do each of the following flagging/calibration steps for each file individually. Sorry, dudes.

1 comment:

katie d. said...

Since we're already on Step 4, I suppose it's a little late for this... but when loading data from the archive I tend to set my FILLM parameters (TIMER) to only give me one data set per day.