PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-06:27:40
G02     18.4           67.6                2.3 +/-    0.62       2.5 +/-    0.62  0.030 / 0.030
G05     156.2          46.7                6.1 +/-    1.01       8.0 +/-    1.01  0.030 / 0.040
G06     45.1           31.5                2.1 +/-    1.47       3.5 +/-    1.47  0.050 / 0.080
G12     271.2          78.8                3.2 +/-    1.59       3.3 +/-    1.59  0.040 / 0.070
G19     86.3           19.7                4.1 +/-    1.70       9.0 +/-    1.70  0.030 / 0.020
G24     220.2          14.4                6.3 +/-    0.98      15.8 +/-    0.98  0.030 / 0.030
G25     313.5          39.3                1.0 +/-    1.27       1.5 +/-    1.27  0.040 / 0.040
G29     295.8          17.4                4.6 +/-    1.90      10.9 +/-    1.90  0.030 / 0.030