map_file [file_name]
Name the map file. This is a special bricked electron density file made up of (8 x 8 x 8) byte cubes of density. It is made from standard maps, (CCP4, X-PLOR, PROTEIN, etc.), with a program called mappage (see section 8.2). This file structure is the same one used in most versions of FRODO (but not in Phillip Evans' version). Another bricked map format is supported in O versions 5.9.2 or newer. It can be moved from any computer to any other, and the header contains more information, most importantly, the sigma level of the map. The new map is calculated by the brix program (see section 8.3). O will automatically figure out how the density file is formatted.