[Chimera-users] soft roll off edges with Zone masks

[Adam Frost]

hi Chimera users

We have determined a pseudo-atomic resolution cryoEM density of a helical
co-polymer (two unique chains for the repeating hetero-dimer). We would
like to compute map-versus-model FSC curves for each of the unique chains.
We'd like to use the Zone tool to mask out the relevant density per chain
within ~3A or so of the atoms in our atomic model, but we would like the
edges of this mask to be appropriately "soft" (whereas right now zone
masking appears to employ a hard edge). has anyone already solved this
problem?

~Adam
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