The following files are included: Circum.exe The executable file. Run under DOS or under the DOS prompt in Windows. Gfm3ec.dat The data file described in the "Notes on usage" (Usage.pdf) Gfm3ec.out The output file annotated in Usage.pdf Revcirc.dat A data file used in B92 Revcirc.out The corresponding output file Usage.pdf PDF file containing "Notes on usage" The .dat and .out files are text files. The Usage.pdf file may be printed using the Adobe Acrobat Reader which may be downloaded free of charge from http://www.adobe.com