Number of stations per 0.5 degree grid:

filename: yyyy_st_pro_ras_05.dat (yyyy=year; 1951-2000)
12 month per file (column #1-#12 => Jan-Dec)

row 1-259200: number of stations per grid used for interpolation

orientation: from west to east ; north to south

C Pseudocode:

grid[12][720][360];

for(year=1951;year<=2000;year++)
   for(lat=0;lat<360;lat++)
      for(lon=0;lon<720;lon+++)
         read(year_st_pro_ras_05.dat,"12x(integer)\n",grid[1-12][lon][lat]);


....
