don't calculate max_transient_amplification_index_at_ky unless g_exb_start_timestep is specified. Return nil if not since won't be an accurate value
don't calculate max_transient_amplification_index_at_ky unless
g_exb_start_timestep is specified. Return nil if not since won't be an
accurate value

edmundhighcock/gs2crmod,edmundhighcock/gs2crmod