keepcols "r2id_spec v e_v v_gas e_v_gas sig e_sig sig_gas e_sig_gas h3 e_h3 h3_gas e_h3_gas h4 e_h4 h4_gas e_h4_gas age e_age met e_met mgfe e_mgfe chi2 weight z e_z dof len nomask nans snr_median nlines len_fit nomask_fit nans_fit"