From: Walter Stafford <STAFFORD@bbri.harvard.edu>
  To  : stafford@tiac.net, stafford@bbri.harvard.edu, jkzmm@clemson.edu, david@spin6.mcb.UCONN.edu, jiawen@spin6.mcb.UCONN.edu, yujia@spin6.mcb.UCONN.edu, RLW@shcc.org, jwallace@biochem.adelaide.edu.au
  Date: Mon, 7 Apr 1997 14:47:39 -0400 (EDT)

New Version of DCDT for Macintosh

Hi RASMBers,

	A new version of DCDT for the Macintosh has been uploaded to the 
RASMB anonymous FTP site. It can be found in the following directory path:

[ANONYMOUS.RASMB.SPIN.MAC.DCDT-STAFFORD]dcdt_mac.hqx

or:

ftp://bbri.harvard.edu/RASMB/SPIN/MAC/DCDT-STAFFORD/dcdt_mac.hqx


It is capable of processing the XL-I files from the Rayleigh system.

There are three versions of the application, one for 680x0 mac's, one for 
PPC's and one for all non FPU machines.

Also included with dcdt is a conversion utility that converts XL-I Rayleigh 
files from ASCII to a binary format that can be read by dcdt. It compresses 
the ascii files by 90% making it 10 time faster to read them in to DCDT. It 
is recommended that you zip the files on the PC, tranfer them to the mac 
and unzip them on the mac. Then convert them to binary and process the 
binary files. Keep the zipped archives but delete the ascii files. You can 
always recover them from the zip archive later if you need to.

The convert utility is somewhat brutish - be careful. Put the files you 
want to convert into a separate folder; put the convert utility in the same 
folder and double click it. It looks for any file with a name having the 
format 00nnn.IPn and converts it to a binary file named B0nnn.ipn. It loops 
through from 00001.ip1 to 00999.ip8. 

The list file should be composed of names with the format 00nnn.ipn. It can 
be used to read either the ascii or the corresponding binary files.

There is an option called "Fine adjust" which you should choose for aligning
the scans. Click in the air-air space in a relatively flat spot. [Try to
match you menisci as closely as possible when you load the cell. The
Rayleigh system is not as forgiving as the scanner. If the menisci are not
carefully matched, you won't get good cancellation of the buffer
redistribution and you will get skewed baselines that get worse with time.]

Then choose option (3) for taking care of integral fringe shifts.

You will know whether or not you've done these two operations correctly 
(Fine adjust and (3)) if you have nice, small error bars in the g(s*) plot.

If you have any questions or problems, email me:
stafford@bbri.harvard.edu

Have fun.

Walter Stafford