[Chimera-users] how to set initial threshold when opening a mrc

Hi, When I open an .mrc map, Chimera will show the map with an initial threshold. But the initial threshold is not so good, so I changed it to high value with the scale bar in Volume Viewer. I want to save the map, so that when I open the map again, the initial threshold will be the high value, not the lower one. How could I do this? Best, Shuo