checkCIF procedure

PROC-NAME: DIFMN01 Type_1

PURPOSE: To check that _refine_diff_density_min is less than _refine_diff_density_max.

PROCEDURE:
TEST
IF _refine_diff_density_min >= _refine_diff_density_max
issue ALERT A
   "Alert A The minimum difference density cannot exceed the maximum difference density"

You have given the minimum residual electron density with a value greater than the maximum residual electron density. Check that you have not accidentally reversed these values, and that you have not forgotten the negative sign for the minimum residual electron density.