PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/06/28-13:42:30
G07     342.9          61.4                8.2 +/-    0.56       9.2 +/-    0.56  0.060 / 0.040
G08     88.0           52.8                8.1 +/-    1.59       9.9 +/-    1.59  0.040 / 0.040
G09     182.8          65.5                9.3 +/-    0.56      10.1 +/-    0.56  0.090 / 0.080
G11     141.4          17.5                8.1 +/-    1.21      18.8 +/-    1.21  0.070 / 0.070
G23     156.8          32.8                8.5 +/-    1.69      14.1 +/-    1.69  0.030 / 0.030
G27     49.4           28.0                6.9 +/-    2.34      12.6 +/-    2.34  0.040 / 0.040
G28     242.9          34.6                9.0 +/-    1.44      14.4 +/-    1.44  0.120 / 0.120
G30     307.0          39.2                8.0 +/-    1.18      11.7 +/-    1.18  0.060 / 0.090