PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-20:12:50
G01     94.8           30.7               16.7 +/-    1.52      28.9 +/-    1.52  0.030 / 0.030
G07     121.6          49.4               17.3 +/-    0.52      22.0 +/-    0.52  0.030 / 0.030
G08     42.2           13.8               10.4 +/-    3.58      26.5 +/-    3.58  0.200 / 0.370
G11     75.0           42.0               15.3 +/-    1.63      21.6 +/-    1.63  0.110 / 0.540
G13     299.2          34.4               12.7 +/-    1.50      20.4 +/-    1.50  0.030 / 0.060
G17     212.7          45.3               19.4 +/-    1.12      26.1 +/-    1.12  0.040 / 0.060
G18     68.4           24.7               13.8 +/-    1.70      27.2 +/-    1.70  0.070 / 0.170
G19     213.1          22.5               20.9 +/-    1.55      43.2 +/-    1.55  0.060 / 0.150
G28     342.0          61.9               14.1 +/-    0.67      15.8 +/-    0.67  0.040 / 0.040
G30     92.4           77.1               15.5 +/-    0.40      15.9 +/-    0.40  0.030 / 0.040