Section 25.2.1.8.1.3. Mask verification and manual editing

Both solvent masks and NC symmetry averaging masks can be examined and edited interactively using the program MAPVIEW. The program reads an electron-density map and (possibly) the corresponding mask. It then displays map sections contoured at any desired level. It can also be used to view the mask superimposed on the contoured map. One can scroll through all sections of the map one at a time, examining the corresponding mask assignment. If desired, one can manually edit the mask by tracing out the protein boundary using a cursor tied to a mouse, or even create the entire mask from scratch in this manner. Other features of MAPVIEW will be described later.