PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/17-21:28:10
G01     47.1           23.2                9.8 +/-    1.99      19.9 +/-    1.99  0.230 / 0.360
G06     178.8          25.7               14.9 +/-    1.66      28.8 +/-    1.66  0.210 / 0.330
G11     43.6           11.5                9.5 +/-    2.72      25.7 +/-    2.72  0.050 / 0.030
G13     246.2          29.1               13.9 +/-    2.93      24.8 +/-    2.93  0.050 / 0.040
G15     279.7          15.2               10.5 +/-    1.47      26.1 +/-    1.47  0.050 / 0.050
G17     334.2          77.5               13.9 +/-    0.42      14.2 +/-    0.42  0.050 / 0.050
G19     251.7          62.8               13.8 +/-    0.55      15.3 +/-    0.55  0.090 / 0.210
G24     318.4          11.7               -2.3 +/-   36.21      -6.1 +/-   36.21  0.130 / 0.170
G28     51.5           54.4               10.1 +/-    2.29      12.1 +/-    2.29  0.060 / 0.070
G30     150.8          36.6               11.9 +/-    1.44      18.4 +/-    1.44  0.060 / 0.070