 points (locations)
$ for each location a line containing sample longitude, latitude, elevation
$ as well as Apatite He age, error in age, Apatite FT age, error in age
$ with a negative age corresponding to a non-existing age
Nil

$ (13) the default age (in Myr) for rocks that never reach the closure temperature, a flag to decide which
$ apatite FT routine to use (0 = van der Beek or 1 = Ketcham), a flag to decide whether (flag=0) to use the absolute
$ age difference (between observed and predicted ages) to