PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-19:58:00
G01     102.4          27.9               17.5 +/-    1.50      32.1 +/-    1.50  0.070 / 0.130
G07     113.2          55.2               16.3 +/-    0.35      19.4 +/-    0.35  0.070 / 0.170
G08     42.0           19.6               10.5 +/-    1.33      23.5 +/-    1.33  0.040 / 0.090
G09     174.3          10.1               21.5 +/-    2.60      59.9 +/-    2.60  0.050 / 0.080
G11     84.4           43.2               16.5 +/-    0.64      22.9 +/-    0.64  0.030 / 0.040
G13     306.0          31.1               12.9 +/-    1.45      22.1 +/-    1.45  0.030 / 0.040
G17     209.0          38.4               20.4 +/-    0.99      30.5 +/-    0.99  0.070 / 0.130
G18     75.9           24.8               15.0 +/-    1.00      29.4 +/-    1.00  0.080 / 0.170
G28     327.9          61.6               14.0 +/-    0.91      15.7 +/-    0.91  0.030 / 0.060
G30     56.4           79.2               15.0 +/-    0.96      15.2 +/-    0.96  0.030 / 0.050