PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/23-13:27:50
G01     117.3          19.2                8.3 +/-    1.11      18.6 +/-    1.11  0.030 / 0.030
G07     85.6           65.5                7.4 +/-    0.29       8.1 +/-    0.29  0.040 / 0.030
G08     43.9           29.0                6.0 +/-    0.59      10.7 +/-    0.59  0.160 / 0.200
G09     175.5          22.4                7.5 +/-    0.95      15.5 +/-    0.95  0.120 / 0.150
G11     103.2          40.7                9.0 +/-    1.07      12.9 +/-    1.07  0.060 / 0.080
G13     316.6          21.2                3.5 +/-    1.35       7.5 +/-    1.35  0.050 / 0.100
G17     202.1          26.8                7.5 +/-    0.81      14.0 +/-    0.81  0.040 / 0.070
G18     91.8           21.5                8.1 +/-    1.01      17.2 +/-    1.01  0.040 / 0.060
G28     296.2          58.0                5.8 +/-    1.18       6.7 +/-    1.18  0.020 / 0.050
G30     348.1          69.7                6.3 +/-    0.92       6.6 +/-    0.92  0.030 / 0.040