PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-19:28:00
G02     318.2          80.3                6.9 +/-    0.74       7.0 +/-    0.74  0.050 / 0.110
G05     165.6          30.6               11.4 +/-    1.30      19.7 +/-    1.30  0.050 / 0.090
G06     41.4           41.2                6.4 +/-    0.43       9.2 +/-    0.43  0.040 / 0.040
G12     314.5          72.0                5.8 +/-    0.54       6.1 +/-    0.54  0.030 / 0.030
G17     83.8           13.0                8.1 +/-    1.75      21.0 +/-    1.75  0.030 / 0.050
G19     70.5           31.5                8.5 +/-    0.97      14.4 +/-    0.97  0.030 / 0.040
G24     229.4          24.4               10.9 +/-    2.51      21.7 +/-    2.51  0.070 / 0.160
G25     317.5          26.5                5.3 +/-    1.78      10.1 +/-    1.78  0.080 / 0.170