PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-14:57:40
G02     217.8          61.6                9.7 +/-    1.05      10.8 +/-    1.05  0.050 / 0.060
G06     54.1           73.7                8.0 +/-    0.73       8.3 +/-    0.73  0.070 / 0.070
G12     319.3          37.9                6.8 +/-    1.01      10.3 +/-    1.01  0.070 / 0.070
G17     61.2           28.7                5.3 +/-    0.61       9.6 +/-    0.61  0.080 / 0.090
G19     44.5           46.0                5.8 +/-    0.39       7.7 +/-    0.39  0.040 / 0.110
G24     264.5          40.9               10.7 +/-    1.04      15.4 +/-    1.04  0.050 / 0.100
G28     124.7          11.2                7.2 +/-    2.79      19.7 +/-    2.79  0.030 / 0.040