[chimerax-users] How to measure the correlation length of a map in ChimeraX

Dear ChimeraX Developers, I have an EM density map and need to measure its diameter and height. I used the "measure and color blob" tool, which displays the length, width, and height of the entire EM density when clicked. However, the values are measured around the entire density map, making them slightly larger than the actual diameter. Therefore, I tried using the "tape" tool to measure, but it is difficult to select two perfectly horizontal points for an accurate measurement. I would like to ask how to measure the correlation length of a map in ChimeraX. Looking forward to your answer, thank you! Best regards, Nan Nan Zhang zhangnan@nankai.edu.cn