It looks like lines 180-196 of exploreACMT() expects the TS data to have a min. TS bin of -76 dB and a max. of -16 dB.
When I changed this range to -60 to -30 dB by reexporting from Echoview, this section failed, likely because the attempt to define the variable colz fails upon trying to use columns that don't exist.
This is related to issue #9.