$ ../boundaries.pl lldt_bot.txt
MIN DATE  =  19810402
MAX DATE  =  20070427
NORTH LAT =   78.7733
SOUTH LAT =  -72.4933
EAST LON  =   20.0057
WEST LON  =   20.9675
$ ../boundaries.pl lldt_ctd.txt
MIN DATE  =  19011213
MAX DATE  =  20070426
NORTH LAT =   78.6983
SOUTH LAT =  -76.7170
EAST LON  =   25.7488
WEST LON  =   26.4887
$ vim lldt_boundaries.txt