
                                       Lappeenranta, May 7, 1993

Welcome to the user group of RIETVELD/HARMONICS.

The source program is written in standard FORTRAN 77 form arranged
in 25 separate blocks according to the different operations to be 
performed. For instance, the program Y.FOR calculates the values of 
harmonic functions, TEXTUR.FOR picks the right harmonic functions for 
the space group and so on.

The executiveable program can be generated by compiling and linking
the main program REFINEMENT.FOR in usual way. This operation unifies
all the separate parts into the binary file REFINEMENT.EXE.

The text file INFO.TXT begins with a short history of this program.
There are lists of variables, parameters and some default values, the IO
units are also described. The structure and format of input and output 
data are explained in the text file GUIDE.TXT.

There is two different type of example data file pairs: MG100.MES, MG100.PAR
and OLIVIN.MES, OLIVIN.PAR. MG100 data is from a real measurement and OLIVIN
data is a simulated version. The *.MES files consist of rough intesity data
and background information and are used for preparing data for refinement.
The *.PAR files contain all the structure information and controll codes
needed in refinement process. The refinement can be performed with these 
data by using the command @GO MG100 or @GO OLIVIN, and the results will come
into the file OUT.DAT.

In the present package there is no graphics, but in advance, I hope,
the program will be developed and the graphics will be added. 
I would be happy if you could inform me about mistakes and shortcomings 
of this version. I would also appreciate very much your note of 
application and would be grateful to hear about your experiences. 
My email address is Matti.Jarvinen@lut.fi.

Matti Jarvinen
Lappeenranta University of Technology
P.O.Box 20, SF-53851 LPR
FINLAND


