E. coli cells are simultaneously infected with two strains of phage . One strain has a mutant host range, is temperature-sensitive, and produces clear plaques (genotype hstc ). The other strain carries the wild-type alleles (genotype h+st+c+). Progeny phages are collected from the lysed cells and plated on bacteria. The experimental data are summarized in the table. Determine the map distance between the genes in map units (m.u.)..