$ gemmi wcn -h
Usage:
 gemmi wcn [options] INPUT[...]
Calculation of local density / contact numbers: WCN, CN, ACN, LDM, etc.
  -h, --help       Print usage and exit.
  -V, --version    Print version and exit.
  -v, --verbose    Verbose output.
  -f, --file=FILE  Obtain paths or PDB IDs from FILE, one per line.
  -l, --list       List per-residue values.
  --min-dist=DIST  Minimum distance for "contacts" (default: 0.8).
  --cutoff=DIST    Maximum distance for "contacts" (default: 15).
  --pow=P          Exponent in the weighting (default: 2).
  --blur=SIGMA     Apply Gaussian smoothing of predicted B-factors.
  --rom            Rotation only model: |pos-ctr_of_chain|^P instead of WCN.
  --chain=CHAIN    Use only one chain from the INPUT file.
  --sanity         Run sanity checks first.
  --sidechains=X   One of: include, exclude, only (default: include).
  --no-crystal     Ignore crystal symmetry and intermolecular contacts.
  --omit-ends=N    Ignore N terminal residues from each chain end.
  --print-res      Print also resolution and R-free.
  --xy-out=DIR     Write DIR/name.xy files with WCN and B(exper).