checkCIF procedure

PROC-NAME: DIFMN03 Type_1

PURPOSE: To check that if _refine_diff_density_min is not within expected limits that the adjacent site is identified.

PROCEDURE:
DMIN = _refine_diff_density_min
DTEST = 0.1 * ZMAX

TEST
IF DMIN < -DTEST*.75 atom site should be identified.
Issue ALERT C
   "Alert C The minimum difference density is < -0.1*ZMAX*0.75 The relevant atom site should be identified."

The minimum residual electron density is more negative than normally expected. Please specify the name of the nearest atom to this minimum and its distance from the minimum.