PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-14:12:50
G01     62.8           31.2                8.6 +/-    0.68      14.7 +/-    0.68  0.030 / 0.040
G06     181.0          12.6               10.0 +/-    4.82      26.3 +/-    4.82  0.030 / 0.040
G07     140.7          22.0               10.3 +/-    1.98      21.6 +/-    1.98  0.060 / 0.130
G11     48.8           23.3                6.8 +/-    2.10      13.8 +/-    2.10  0.060 / 0.120
G13     268.4          35.6                8.8 +/-    1.25      13.8 +/-    1.25  0.110 / 0.210
G15     298.7          15.5                4.3 +/-    1.68      10.5 +/-    1.68  0.070 / 0.180
G17     255.4          77.2                9.8 +/-    0.33      10.0 +/-    0.33  0.080 / 0.070
G19     230.4          50.4               11.3 +/-    1.83      14.2 +/-    1.83  0.060 / 0.070
G28     31.7           57.3                7.5 +/-    0.73       8.7 +/-    0.73  0.020 / 0.020
G30     141.2          57.1                8.8 +/-    0.75      10.3 +/-    0.75  0.020 / 0.020