Colleagues:

I have had to make a few more modifications to v3.1.  These below have just now been 
addeded to the /users/tbania/idl/v3.1/ directory in Green Bank.  If you have already
installed this stuff, you need to copy the new files.  You will need to re-run the
.html maker procedure for v3.1 if you want these changes to be reflected in the
.html help.  Again, I have modified the mk_html_v3_1.pro file in GB to do this
*and* have created a new gbt_idl_v3.1.html.

Sorry if any of you has been inconvenienced.

The following four commands/files have been changed in ../v3.1
              ----
../v3.1/DOCS/OVERVIEW        fixed typos and slighly enhanced the text
../v3.1/DOCS/V3.1.1          THIS TEXT

start_GBT
make_ONLINE

these two files were altered so that one can start GBT_IDL without creating an online.gbt
file from an SDFITS fits file.  This is very useful if you already have made online.gbt
files and merely want to ATTACH these existing files.  This saves on processing again and
again the same SDFITS files.

You will see the following new output when you run the package:

Do you want to make the ONLINE file? (y/n) 

==> IF 'N' you get:

*************************************************
There is NO ONLINE data file!
Please ATTACH one and issue ONLINE command.
*************************************************

Input # data points per spectrum                
Input # data points per spectrum:4096   <== must notify GBT_IDL so {gbt_data} can be defined
==> Spectra have   4096 data points
Input # records per scan, i.e. # subcorrelators in configuration
Input # records per scan: 16            <== must notify GBT_IDL so TP PS routines work
==> Each Scan makes  16 spectra
Current NSAVE file is:
Nsave file= ../data/nsave.dat LUN= 100
NSlog file= ../data/nsave.log LUN= 101

Do you want to make a new NSAVE file? (y/n: n means use the above files)
Make NSAVE? (y or n):n

Nsave file= ../data/nsave.dat LUN= 100
NSlog file= ../data/nsave.log LUN= 101


Files currently being used are:

SDFITS  Data  file= ../data/test_data.avg.acs.fits LUN= 104
ONLINE  Data  file=  LUN= 102
OFFLINE Data  file= ../data/offline.gbt LUN= 103

Nsave file= ../data/nsave.dat LUN= 100
NSlog file= ../data/nsave.log LUN= 101
PLOT  file= ../figs/idl.ps

Journal   = ../saves/journal.dat
SAVE_state= ../saves/state.dat
SAVE_procs= ../saves/procs.dat
STACK is now empty

NSAVE write protection turned ON