double cur_pt = (entry->sec - (entry-1)->sec) *
(1 + (entry->depth + (entry-1)->depth) / 20000.0);
INTERPOLATED_PRESSURE(entry) =
double cur_pt = (entry->sec - (entry-1)->sec) *
(1 + (entry->depth + (entry-1)->depth) / 20000.0);
INTERPOLATED_PRESSURE(entry) =