PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-11:13:10
G02     26.0           62.0                6.1 +/-    0.76       6.8 +/-    0.76  0.030 / 0.030
G05     152.6          52.9               12.1 +/-    0.69      14.7 +/-    0.69  0.030 / 0.030
G06     47.3           28.5                3.8 +/-    2.00       6.9 +/-    2.00  0.030 / 0.020
G12     231.5          77.4                7.7 +/-    0.45       7.9 +/-    0.45  0.030 / 0.020
G19     92.8           14.7                6.4 +/-    3.81      16.0 +/-    3.81  0.060 / 0.130
G20     198.8          14.8                6.4 +/-    3.00      16.1 +/-    3.00  0.070 / 0.150
G25     308.2          46.5                6.1 +/-    1.64       8.1 +/-    1.64  0.040 / 0.060
G29     302.3          24.5                6.1 +/-    1.64      12.1 +/-    1.64  0.040 / 0.050