[Chimera-users] generating/saving mask files using segmentation

Hi, I am a beginner and still in the learning phase of chimera. Here is my question. I generated the mask from relion (mask creation) and open the mask in chimera. Using segmentation, I successfully split the mask into three segments and saved them individually. Then, I found that each mask file changes its box size (smaller than the original mask) and failed to run the multi-body refinement in relion. Using relion_image_handler (--new_box), I changed the box size but now the origin is shifted and all three masks are overlapping each other by losing their relative position. Is there a way to save the segmented mask maps by maintaining its original box size and relative position? Thanks. Best, Uhnsoo