PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-13:13:00
G01     125.9          12.6                7.8 +/-    2.08      20.5 +/-    2.08  0.030 / 0.040
G07     57.0           69.4                6.5 +/-    0.48       6.9 +/-    0.48  0.040 / 0.030
G08     49.1           37.8                6.1 +/-    1.02       9.3 +/-    1.02  0.030 / 0.030
G09     176.7          33.0                5.6 +/-    0.68       9.3 +/-    0.68  0.030 / 0.030
G11     116.0          36.1                7.2 +/-    0.95      11.3 +/-    0.95  0.080 / 0.350
G13     320.7          12.9                4.0 +/-    2.99      10.6 +/-    2.99  0.180 / 0.470
G17     200.0          16.4                6.7 +/-    3.20      16.0 +/-    3.20  0.150 / 0.330
G18     102.1          17.3                6.0 +/-    1.58      14.2 +/-    1.58  0.170 / 0.260
G28     278.3          53.5                6.7 +/-    2.92       8.1 +/-    2.92  0.110 / 0.210
G30     333.3          61.0                5.2 +/-    0.92       5.9 +/-    0.92  0.110 / 0.210