## automodel.max_ca_ca_distance — Distance cutoff for CA-CA homology-derived restraints

> This is the cutoff distance for Cα - Cα homology-derived restraints (it is passed to Restraints.make_distance() as the maximal_distance parameter when these restraints are generated). No Cα - Cα distances greater than this value will be used in building homology-derived restraints; thus, reducing this value from the default will typically reduce the number of restraints and increase the speed of optimization.

> The default value of this parameter is 14.0 angstroms.

> See also automodel.max_n_o_distance, automodel.max_n_o_distance, automodel.max_sc_mc_distance, and automodel.max_sc_sc_distance for similar cutoffs for the other kinds of homology-derived distance restraints.

> See also automodel.very_fast(), which decreases all of these distances from their default values.