PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-01:57:40
G02     354.7          77.1                6.6 +/-    0.55       6.8 +/-    0.55  0.030 / 0.030
G05     162.3          35.9               10.9 +/-    0.86      17.0 +/-    0.86  0.030 / 0.040
G06     42.0           39.0                4.6 +/-    0.69       6.8 +/-    0.69  0.040 / 0.080
G12     309.2          72.2                7.6 +/-    0.35       8.0 +/-    0.35  0.050 / 0.100
G17     85.4           14.7                5.9 +/-    1.02      14.7 +/-    1.02  0.100 / 0.150
G19     75.9           27.2                7.0 +/-    0.60      13.0 +/-    0.60  0.090 / 0.170
G24     227.5          21.8               13.6 +/-    2.53      28.6 +/-    2.53  0.120 / 0.170
G25     317.2          29.2                6.3 +/-    1.05      11.2 +/-    1.05  0.120 / 0.190