[ferret_users] how to fill using ASCII data

[Wendy Wang <wwang@xxxxxxxxxxxxx>]

Hi ferret users,

Is there a simple way to do FILL using 3-column data similar to
Plot/vs chl, depth   ????


lat	chl	depth
-8.0	0.23	10
-8.0	0.22	25
-8.0	0.23	40
-8.0	0.22	60
-8.0	0.22	100
-8.0	0.07	150
-7.0	0.19	10
-7.0	0.22	25
-7.0	0.27	40
-7.0	0.29	60
-7.0	0.20	100
-7.0	0.07	150
-6.0	0.22	10
-6.0	0.23	25
-6.0	0.23	40
-6.0	0.27	60
-6.0	0.18	100
-6.0	0.18	150
.........

Thanks in advance,
Wendy Wang