Export Lab data from a device gamut surface

looking to just extract the data from the shell of the profile gamut (see sample)
with no internal colors. Just the data for the empty shell, need to create printable patches of just these colors. please advise

currently it exports but the complete data set for the entire profile with internal colors are included. as chromix is plotting just these colors, hoping they are called out and then can be extracted and exported as a txt file…