PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-07:27:30
G07     331.1          57.4                5.4 +/-    0.56       6.3 +/-    0.56  0.030 / 0.040
G08     99.2           50.9                6.7 +/-    0.55       8.4 +/-    0.55  0.030 / 0.040
G09     178.7          71.2                7.3 +/-    0.38       7.7 +/-    0.38  0.050 / 0.070
G11     145.9          12.5                6.9 +/-    2.20      18.1 +/-    2.20  0.050 / 0.070
G23     155.4          45.0                7.3 +/-    0.67       9.9 +/-    0.67  0.060 / 0.080
G27     58.1           33.6                5.1 +/-    1.29       8.3 +/-    1.29  0.080 / 0.090
G28     235.4          27.0                5.9 +/-    1.30      11.0 +/-    1.30  0.040 / 0.050
G30     299.4          32.4                3.4 +/-    2.73       5.6 +/-    2.73  0.040 / 0.060