PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-18:27:50
G01     100.4          28.7               11.8 +/-    1.04      21.2 +/-    1.04  0.020 / 0.040
G07     115.7          53.6               12.2 +/-    0.44      14.7 +/-    0.44  0.030 / 0.050
G08     41.9           16.9                8.6 +/-    1.87      20.5 +/-    1.87  0.130 / 0.180
G11     81.1           42.7               12.8 +/-    0.52      17.8 +/-    0.52  0.120 / 0.230
G13     304.1          32.2               12.1 +/-    0.86      20.3 +/-    0.86  0.040 / 0.030
G17     209.6          41.5               15.7 +/-    1.08      22.4 +/-    1.08  0.040 / 0.030
G18     73.7           24.9               11.5 +/-    0.94      22.6 +/-    0.94  0.050 / 0.050
G19     211.3          17.5               10.3 +/-   12.00      24.0 +/-   12.00  0.040 / 0.060
G28     331.4          61.8               10.8 +/-    0.87      12.1 +/-    0.87  0.040 / 0.080
G30     63.3           79.4               11.5 +/-    1.00      11.7 +/-    1.00  0.040 / 0.090