means:

         V3      V2       V1  Post-V1
a 1066.119 865.6006 791.0884 965.5335
b 1185.912       NA 759.0366 898.9848

cis:

         V3      V2       V1       Post-V1
lower a 958.2569 778.7420 699.0721 891.3983
lower a 1016.9277    NA  685.6737  828.9860
upper b 1173.9809 952.4592 883.1047 1039.6687
upper b 1354.8955    NA  832.3994  968.9835