PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-09:57:30
G02     298.3          82.3                4.6 +/-    0.46       4.6 +/-    0.46  0.070 / 0.150
G05     168.5          24.4                6.0 +/-    1.43      12.0 +/-    1.43  0.050 / 0.150
G06     38.4           55.0                3.0 +/-    0.37       3.6 +/-    0.37  0.080 / 0.110
G12     319.6          60.0                4.0 +/-    0.76       4.5 +/-    0.76  0.080 / 0.130
G17     79.4           16.0                4.9 +/-    1.21      12.0 +/-    1.21  0.030 / 0.040
G19     67.4           31.8                4.2 +/-    0.95       7.1 +/-    0.95  0.030 / 0.040
G24     237.4          29.3                4.9 +/-    1.46       8.7 +/-    1.46  0.070 / 0.260
G25     317.8          20.7                3.9 +/-    1.93       8.5 +/-    1.93  0.080 / 0.330