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- If neither are given via command line or in the source uncertainties file, the defaults will be used.
- If rvfrac is given in the source uncertainties file (and rvfac is not provided any where), it is perturbated and then copied to rvfac.
- If rvfac is given via command line to gcmt2srf or in the source uncertainties file (and rvfrac is not given), it is perturbated , but not and then copied to rvfrac, which will use the default.
- If both are given, either via command line or the source uncertainties file, they are perturbated and used separately.
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