-Change column name to 'Gas' as changed in Subsurface. -Replace '--' with 'Air' to empty tanks. Signed-off-by: Gehad elrobey <gehadelrobey@gmail.com> Signed-off-by: Miika Turkia <miika.turkia@gmail.com> Signed-off-by: Dirk Hohndel <dirk@hohndel.org>