PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-20:28:00
G05     48.8           19.2               10.2 +/-    0.57      22.8 +/-    0.57  0.120 / 0.270
G10     237.4          12.8               13.8 +/-    2.99      36.1 +/-    2.99  0.160 / 0.250
G13     75.4           37.4               12.7 +/-    0.46      19.4 +/-    0.46  0.060 / 0.080
G15     121.7          53.1               14.6 +/-    1.05      17.7 +/-    1.05  0.040 / 0.070
G16     315.7          10.9               10.2 +/-    9.66      27.9 +/-    9.66  0.160 / 0.570
G18     247.3          43.6               16.1 +/-    1.96      22.2 +/-    1.96  0.170 / 0.610
G20     29.6           64.6               14.1 +/-    0.53      15.4 +/-    0.53  0.050 / 0.090
G21     315.7          49.3               14.5 +/-    0.77      18.5 +/-    0.77  0.060 / 0.110
G26     289.5          19.1               12.5 +/-    1.05      28.2 +/-    1.05  0.040 / 0.050
G29     154.6          65.7               14.4 +/-    0.72      15.6 +/-    0.72  0.040 / 0.040