PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-04:57:50
G01     64.0           31.7                3.3 +/-    0.76       5.6 +/-    0.76  0.050 / 0.210
G07     140.2          23.4                5.8 +/-    1.88      11.8 +/-    1.88  0.060 / 0.170
G11     49.1           25.2                3.2 +/-    1.18       6.3 +/-    1.18  0.120 / 0.240
G13     266.5          36.8                5.4 +/-    1.06       8.4 +/-    1.06  0.110 / 0.260
G15     298.5          15.5                1.5 +/-    2.49       3.7 +/-    2.49  0.080 / 0.110
G17     250.8          76.8                4.6 +/-    0.78       4.7 +/-    0.78  0.070 / 0.130
G18     42.4           12.6                1.3 +/-    1.14       3.5 +/-    1.14  0.040 / 0.070
G19     228.4          45.2                5.6 +/-    1.78       7.5 +/-    1.78  0.040 / 0.060
G28     25.6           58.8                3.2 +/-    0.71       3.7 +/-    0.71  0.050 / 0.050
G30     141.3          57.5                6.6 +/-    0.79       7.6 +/-    0.79  0.040 / 0.050