[daip] RESTFREQ.HLP

[Leonia Kogan]

Gustaff,

You are right. There is a mistake at the example given at 
the RESTREQ.HLP file.

But this mistake is at the different term (at the second one)

Indeed 
1.420405752E6 = (1.4204 + 0.000005752) * 1.0E6 = 1.4204E6 + 5.752
                                                 ^^^^^^^^^^^^^^^^
The RESTREQ.HLP gives 1.4204E6 5752 instead of correct 1.4204E6 5.752

Leonia


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>From daip-admin at donar.cv.nrao.edu Thu Dec 12 14:47 MST 2002
From: Gustaaf Van Moorsel <gvanmoor at cv3.cv.nrao.edu>
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Date: Thu, 12 Dec 2002 14:46:28 -0700
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Dear designated AIP,

When I copied the values in the RESTFREQ help file to
specify the HI line I got a wrong result. The reason is
that in RESTREQ.HLP the first element in the array is in
terms of E6 instead of E9.

See:

Use:  To specify the spectral-line rest frequency in Hertz.
       RESTFREQ is an array to allow greater precision in the
       specified value.  The rest frequency is taken to be
       RESTFREQ(1) + RESTFREQ(2) with both values converted to
       double precision before adding.  For example, the
=>    frequency 1.420405752E6 is too precise for a single
=>    adverb.  However, RESTFREQ = 1.4204E6, 5752. will convey
       the desired value correctly.  NOTE, if RESTFREQ(1) =
       RESTFREQ(2), then the rest frequency is taken to be just
       RESTFREQ(1).

I wonder how long this has been there ...

Gustaaf

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