[chimerax-users] Discrepancies in SASA values between chimera and chimeraX

Hi Elaine, I compared the SASA values generated by chimera and chimeraX for a few PDB files and I noticed that whenever the SASA value of a residue is reported to be zero by chimera, the same residue's SASA value is reported to be -1.42 by chimeraX. Few examples are 18.A and 38.A of the PDB ID 1A62. *Method used to calculate SASA of residues in chimera: *Tools > Structure analysis > Render by attribute *Method used to calculate SASA **of residues** in chimeraX: *I ran the following commands: measure sasa protein;info residues attribute area Why is this happening? Kindly help. -- Prathvi Singh, Research Fellow, Department of Biological Sciences & Bioengineering, Indian Institute of Technology, Kanpur-208016