PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-14:42:40
G01     51.3           26.0                9.6 +/-    2.72      18.4 +/-    2.72  0.090 / 0.180
G06     178.3          23.5               12.6 +/-    2.87      25.5 +/-    2.87  0.120 / 0.200
G07     145.4          11.2               11.1 +/-    1.63      30.1 +/-    1.63  0.140 / 0.200
G11     44.4           13.9                7.4 +/-    1.76      19.0 +/-    1.76  0.090 / 0.200
G13     254.4          31.1                9.6 +/-    2.29      16.5 +/-    2.29  0.040 / 0.050
G15     287.6          15.6                7.3 +/-    1.33      17.8 +/-    1.33  0.050 / 0.050
G17     321.2          79.2               10.2 +/-    0.39      10.4 +/-    0.39  0.020 / 0.020
G19     245.9          60.9               10.8 +/-    0.99      12.2 +/-    0.99  0.020 / 0.020
G28     50.6           53.3               10.0 +/-    0.69      12.2 +/-    0.69  0.180 / 0.120
G30     149.0          44.9               11.1 +/-    0.76      14.9 +/-    0.76  0.130 / 0.080