PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-15:42:40
G01     78.2           33.0                8.3 +/-    1.29      13.7 +/-    1.29  0.320 / 0.290
G07     133.3          33.2               11.0 +/-    1.42      18.0 +/-    1.42  0.180 / 0.270
G11     57.3           31.9                8.0 +/-    1.40      13.4 +/-    1.40  0.060 / 0.090
G13     284.9          36.9               10.7 +/-    1.12      16.5 +/-    1.12  0.050 / 0.080
G15     311.2          11.7                8.0 +/-    1.61      21.6 +/-    1.61  0.080 / 0.100
G17     224.1          65.8               12.0 +/-    0.88      13.0 +/-    0.88  0.070 / 0.080
G19     219.8          38.1               11.5 +/-    1.95      17.3 +/-    1.95  0.030 / 0.020
G28     7.8            60.4               10.9 +/-    1.47      12.3 +/-    1.47  0.030 / 0.030
G30     124.5          70.5               11.5 +/-    0.75      12.1 +/-    0.75  0.060 / 0.040