PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-00:27:50
G07     336.2          59.0                4.5 +/-    0.89       5.1 +/-    0.89  0.110 / 0.140
G08     96.8           52.6                6.8 +/-    0.61       8.3 +/-    0.61  0.070 / 0.140
G09     191.3          72.1                6.9 +/-    0.80       7.2 +/-    0.80  0.040 / 0.040
G11     145.7          13.8                6.4 +/-    1.72      16.3 +/-    1.72  0.030 / 0.040
G23     156.1          39.1                7.8 +/-    0.69      11.4 +/-    0.69  0.040 / 0.040
G27     52.3           29.8                5.1 +/-    1.31       9.0 +/-    1.31  0.050 / 0.040
G28     239.5          32.0                6.6 +/-    2.25      11.1 +/-    2.25  0.030 / 0.020
G30     305.8          39.3                5.3 +/-    1.31       7.8 +/-    1.31  0.030 / 0.020