Hi Montserrat, The new morph map tool can switch between two maps without displaying both. You might be interested in showing interpolated maps as well which that tool does. You can obtain it from the Chimera experimental features page. http://www.cgl.ucsf.edu/chimera/experimental/experimental.html There are instructions on how to install it with your current Chimera (1.2304 or newer). It is presently not included in the Chimera distribution. Here's documentation for it. http://www.cgl.ucsf.edu/chimera/experimental/morph_map/morphmap.html If you just want to switch between the two maps without interpolation use morph map step of 1. If this is an inconvenient way to do the simple switching you want I could add a keyboard shortcut that hides the current map and displays the next one. Tom