datatrans

Hi I need to change the gas mix as recorded in SmartTrak (dive computer accidentally set to 100% O2 prior to dive, instead of 21%!). I know that this means having to edit the actual divelog file, but I'm not sure where in the file the gas mix is recorded. Anyone able to help? Thanks in advance

Short back story: I bought this Oceanic DataTrans GDI2 a few years ago right before I moved to Oregon and I never got to use it up there. Then I found my way back to Texas and decided to dust off the old gear. Got it all serviced except for the watch and transmitter but I changed the battery in...