date     leadtime location  lat   lon   altitude  obs   fcst e0 e1
20120101 0        3         50    10    12          3     6  1 2
20120101 6        3         50    10    12          5     7  3 4
20120101 12       3         50    10    12          6     7  8 6
20120102 0        3         50    10    12          5     6  1 2
20120102 6        3         50    10    12          9     8  1 -9
20120102 12       3         50    10    12          12    11 5 12
20120103 0        3         50    10    12          -2    -4 -6 -12
20120103 6        3         50    10    12          0     3  0 2
20120103 12       3         50    10    12          3     9  8 6
