PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-04:42:40
G01     105.5          26.3                5.6 +/-    1.38      10.5 +/-    1.38  0.040 / 0.040
G07     109.3          56.6                5.7 +/-    0.84       6.7 +/-    0.84  0.050 / 0.040
G08     41.8           19.0                3.2 +/-    1.74       7.2 +/-    1.74  0.100 / 0.130
G09     175.0          12.8                5.4 +/-    1.88      14.3 +/-    1.88  0.170 / 0.110
G11     87.9           42.5                5.8 +/-    0.71       8.1 +/-    0.71  0.070 / 0.060
G13     309.3          28.5                2.8 +/-    1.28       5.0 +/-    1.28  0.060 / 0.060
G17     206.4          40.2                6.1 +/-    0.77       8.8 +/-    0.77  0.170 / 0.190
G19     209.4          15.4                4.8 +/-    1.76      11.8 +/-    1.76  0.250 / 0.250
G28     322.5          61.3                3.2 +/-    0.68       3.5 +/-    0.68  0.070 / 0.090
G30     40.9           78.5                4.1 +/-    0.63       4.2 +/-    0.63  0.070 / 0.090