PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-21:12:50
G01     75.0           33.3               14.7 +/-    0.69      24.2 +/-    0.69  0.080 / 0.300
G07     135.3          34.7               16.4 +/-    1.23      26.2 +/-    1.23  0.100 / 0.290
G11     57.5           34.3               11.6 +/-    0.90      18.7 +/-    0.90  0.060 / 0.100
G13     279.4          37.6               15.2 +/-    1.05      23.1 +/-    1.05  0.050 / 0.120
G15     305.5          14.5               10.8 +/-    2.68      27.3 +/-    2.68  0.050 / 0.120
G17     227.1          61.0               17.0 +/-    0.84      19.2 +/-    0.84  0.050 / 0.120
G18     52.3           20.2               12.1 +/-    0.91      26.6 +/-    0.91  0.030 / 0.050
G19     221.8          37.9               18.6 +/-    0.50      28.0 +/-    0.50  0.030 / 0.050
G28     14.0           59.9               12.7 +/-    0.77      14.4 +/-    0.77  0.050 / 0.090
G30     131.4          63.4               15.5 +/-    0.61      17.1 +/-    0.61  0.030 / 0.080