PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/25-12:42:40
G07     38.1           69.7                5.0 +/-    1.00       5.3 +/-    1.00  0.040 / 0.040
G08     53.8           42.3                4.4 +/-    0.91       6.1 +/-    0.91  0.030 / 0.030
G09     177.2          39.4                4.9 +/-    0.69       7.3 +/-    0.69  0.030 / 0.030
G11     122.3          32.6                5.3 +/-    1.41       8.7 +/-    1.41  0.040 / 0.030
G18     107.7          14.3                5.4 +/-    2.49      13.6 +/-    2.49  0.280 / 0.300
G23     160.4          11.4                3.9 +/-    1.59      10.7 +/-    1.59  0.160 / 0.240
G27     38.0           11.1                4.8 +/-    3.38      13.0 +/-    3.38  0.170 / 0.360
G28     269.0          50.2                4.1 +/-    3.01       5.1 +/-    3.01  0.210 / 0.390
G30     326.6          55.8                4.2 +/-    0.45       4.9 +/-    0.45  0.170 / 0.350