read_mrc: read a MCR/CCP4 electronic density map file [Data] = read_mrc(file) <http://en.wikipedia.org/wiki/MRC_%28file_format%29> References: tom_mrcread from Wolfgang Baumeister (TOM Matlab toolbox), 2008 used to read MRC electron density map files <http://www.biochem.mpg.de/en/rd/baumeister/tom_e/> See also: read_poscar, read_pdb, read_xyz, read_nii, read_analyze