[chimera-dev] density map in Chimera

Dear Chimera-dev group, I am a graduate student of Computer Science. I come accross aome problems with the Density map (.mrc file). I noticed that Chimera use the Origin index parameters to locate the density map. I am wondering where these index numbers come from? is it read from the MRC header or does chimera do something about the information in mer header file. thank you for your help. Fei Li Old Dominion University, Norfolk, VA 23508