PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-22:12:40
G02     200.2          22.8               17.7 +/-    2.41      36.4 +/-    2.41  0.090 / 0.110
G06     173.2          53.1               15.8 +/-    0.83      19.2 +/-    0.83  0.070 / 0.120
G13     225.2          12.3               13.3 +/-   11.17      35.4 +/-   11.17  0.050 / 0.070
G17     24.6           58.0               13.3 +/-    0.77      15.4 +/-    0.77  0.060 / 0.070
G19     328.3          70.9               12.3 +/-    0.60      12.9 +/-    0.60  0.230 / 0.320
G24     308.1          31.6               11.5 +/-    1.89      19.4 +/-    1.89  0.300 / 0.320
G28     86.5           42.4               13.6 +/-    1.12      19.1 +/-    1.12  0.040 / 0.030
G30     156.8          11.8               17.5 +/-    6.01      46.9 +/-    6.01  0.040 / 0.030