[daip] more on AVSPC

[Leonia Kogan]

Gustaaf,

I have finished the test of AVSPC. I found that AVSPC does the right job 
but the help file is not complete especially for ICHANSEL

I have added the following paragraph to AVSPC.HLP:

"If ICHANSEL describes averaging explicitly for some IFs, but skips the 
other IFs, the the center 75% of the band is averaged for the skipped IFs.
For example:ICHANSEL=2,6,1,2 => the channels 2-6 will be averaged for 
IF=2 and the center 75% of the band will be averaged for the rest IFs."

I have tested this statement using my data

During the test I did not find identity at the case of your four group

 > ICHANSEL=2,6,1,1
 > ICHANSEL=2,6,1,1,2,6,1,2
 > ICHANSEL=2,6,1,2
 > ICHANSEL=2,6,1,2,2,6,1,2

Instead, I got:

group1: 2-6 are averaged for IF=1, 75% are averaged for the rest IFs
group3: 2-6 are averaged for IF=2, 75% are averaged for the rest IFs

So IF=1 (for example) got 2-6 averaging for group 1, and 75% averaging
for group 2
I think the identity is a feature of your input data.

Send me please the IMH of your data for the beginning.

Leonia

Gustaaf van Moorsel wrote:

> In my previous e-mail, I may have confused the issue unnecessarily
> by varying the channel increment.  To simplify the AVSPC question
> I now ran AVSPC four times on the same dataset containing 2 IFs.
> 
> ICHANSEL=2,6,1,1
> ICHANSEL=2,6,1,1,2,6,1,2
> ICHANSEL=2,6,1,2
> ICHANSEL=2,6,1,2,2,6,1,2
> 
> All four give identical output.  Moreover, the inputs to AVSPC
> in the history file are identical: IF 1: CHANSEL=2,6,1, and IF 2:
> CHANSEL=2,6,1.  Is it therefore correct to assume that AVSPC ig-
> nores the IF part of ICHANSEL?
> 
> Gustaaf
> 
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