The maximum length of not heterozygous stretches flanked
by heterzygous sites that are changed to heterozygous. If set to 1
(default) only HAH or HBH will be corrected. If set to 2, both HAH and HAAH
(or HBH and HBBH) will be corrected.
Value
A genotype object in which undercalled heterozygous sites are
corrected if both flanking alleles match.