PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-13:28:00
G02     38.4           51.0                3.9 +/-    1.32       4.9 +/-    1.32  0.020 / 0.030
G05     133.9          65.2                6.1 +/-    0.36       6.7 +/-    0.36  0.020 / 0.020
G06     55.2           16.2                3.4 +/-    2.87       8.2 +/-    2.87  0.020 / 0.020
G12     197.8          64.0                5.0 +/-    0.64       5.6 +/-    0.64  0.030 / 0.030
G20     199.8          29.3                5.6 +/-    2.57      10.0 +/-    2.57  0.130 / 0.160
G25     288.8          56.5                1.3 +/-    2.47       1.5 +/-    2.47  0.110 / 0.190
G29     313.2          36.0                4.2 +/-    0.67       6.6 +/-    0.67  0.150 / 0.250