PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/12-13:12:30
G07     8.7            67.2                7.6 +/-    0.58       8.2 +/-    0.58  0.040 / 0.040
G08     66.6           49.3                7.0 +/-    0.30       8.9 +/-    0.30  0.040 / 0.050
G09     178.7          51.2                9.3 +/-    1.92      11.6 +/-    1.92  0.100 / 0.140
G11     132.0          25.8                8.2 +/-    1.80      15.7 +/-    1.80  0.110 / 0.140
G23     159.4          20.9                9.1 +/-    1.30      19.5 +/-    1.30  0.070 / 0.110
G27     41.7           19.3                5.9 +/-    1.21      13.3 +/-    1.21  0.050 / 0.090
G28     255.6          43.6                8.4 +/-    1.05      11.6 +/-    1.05  0.030 / 0.040
G30     317.2          47.9                6.1 +/-    0.64       7.9 +/-    0.64  0.030 / 0.040