PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-17:58:00
G01     125.3          12.3                8.8 +/-    1.38      23.4 +/-    1.38  0.030 / 0.030
G07     72.1           65.2                9.5 +/-    0.52      10.4 +/-    0.52  0.030 / 0.040
G08     49.2           37.9                7.9 +/-    0.71      11.8 +/-    0.71  0.130 / 0.340
G09     178.7          35.9                9.8 +/-    1.81      15.2 +/-    1.81  0.110 / 0.330
G11     115.3          36.8               11.0 +/-    1.14      16.8 +/-    1.14  0.060 / 0.070
G13     320.4          13.6                8.2 +/-    1.50      21.1 +/-    1.50  0.070 / 0.070
G17     199.5          16.5               10.9 +/-    1.60      26.2 +/-    1.60  0.060 / 0.130
G18     100.2          17.3                8.9 +/-    2.07      20.8 +/-    2.07  0.060 / 0.110
G28     273.2          50.1                8.2 +/-    1.25      10.3 +/-    1.25  0.090 / 0.330
G30     337.4          63.4                8.8 +/-    0.78       9.7 +/-    0.78  0.090 / 0.360