Table 2 A comparison of the calculated millimeter refraction with Ulich's formula

    Refraction at 45 degrees
    1 - by integration through atmosphere of IMC model at altitude 2.0 km 
        using ASA adjusted by dT       :mean ASA temperature = 2C
                           by dp = 0   :ASA => press = 596 Torr
                           with humidity parameter h =Rel.Hum.(%)/10
        Refraction   R1(")

    2 - by Ulich's formula with press = 596 Torr
        Refraction   R2(")

     h    dT     R1         R2     Diff

     2   -14    49.1       49.2    -0.1
     2   -10    48.6       48.7    -0.2
     2    -6    48.1       48.2    -0.1
     2    -2    47.7       47.8    -0.1
     2     2    47.5       47.5     0.0
     2     6    47.3       47.3     0.0
     2    10    47.2       47.2     0.0
     2    14    47.4       47.3     0.1
     2    18    47.6       47.5     0.1
     2    22    48.1       47.9     0.2
     2    26    48.8       48.6     0.2
     2    30    49.8       49.4     0.4

     5   -14    50.0       50.0     0.0
     5   -10    49.7       49.7     0.0
     5    -6    49.6       49.6     0.0
     5    -2    49.7       49.6     0.1
     5     2    50.0       49.9     0.1
     5     6    50.6       50.4     0.2
     5    10    51.4       51.1     0.2
     5    14    52.6       52.2     0.4
     5    18    54.2       53.7     0.5
     5    22    56.3       55.6     0.7
     5    26    59.0       58.1     0.9
     5    30    62.2       61.1     1.1

     8   -14    50.8       50.8     0.0
     8   -10    50.9       50.8     0.1
     8    -6    51.1       51.0     0.1
     8    -2    51.7       51.5     0.2
     8     2    52.6       52.3     0.3
     8     6    53.8       53.5     0.3
     8    10    55.6       55.1     0.5
     8    14    57.9       57.2     0.7
     8    18    60.8       59.9     0.9
     8    22    64.5       63.4     1.1
     8    26    69.1       67.6     1.5
     8    30    74.6       72.8     1.8