Table 3. Distributions of 9594 families by mutation count under different minimum lethalities.

Mutations	≥99%	≥98%	≥97%
0	8459	7397	6321
1	1052	1919	2743
2	81	258	481
3	2	20	48
4	0	0	1
mt	1220	2495	3853
nm	2673	13439	30,781
$\tilde{\mu }$	0.0098	0.0494	0.1133

m_t, total number of mutations; n_m, total number of mutants; $\tilde{\mu }$, overall mutation rate estimated by Equation (6).