scale density scale factor line

solden solvent density value line

fzovol¹ base electron density value line

sratio¹ base electron density ratio line

1 Only one or the other is used, not both.

APMASK process solvent density

avgden set to average solvent density

nonneg replace -ve value in molecule region with 0

scale scale applied to density values within non-solvent regions 1.

solden value assigned to all solvent densities in resulting map 0.

Will not be used if avgden has been specified on APMASK line.

fzovol 1 F-zero/volume value used as an additive offset to all densities except solvent density in the case of the solden option 0.

sratio non-zero value causes fzovol to be calculated and applied to all densities in the map