Authors: Richard Alden & Jim Stewart

Contact: Jim Stewart, Department of Chemistry,

University of Maryland, College Park, MD 20472, USA

FODIFF performs a simple one-for-one subtraction of the scaled electron density points on maps stored on separate bdfs. The maps must be laid out identically and they must also both be either Fourier maps or Patterson maps. The output is to another bdf. No printed map is possible; that should be done with FOGEN.

File Assignments

Reads FOURR density map 1 from file ma1

Reads FOURR density map 2 from file ma2

Writes difference density map to file mad