wm60min.180x360.grid
world topographic data (in meters) is positive above sealevel
data are average values for 1x1 degree grid using 5' topographic data base.

data are separated bu 0ne or more spaces

180 lines with 360 numbers per line

first number in line 1 represents 
data for 89.5N 0.5E
first number in line 180 represents
data for 89.5S 0.5E