PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-10:12:30
G02     356.2          77.1                2.5 +/-    0.21       2.5 +/-    0.21  0.060 / 0.080
G05     164.1          34.6                5.2 +/-    1.41       8.3 +/-    1.41  0.050 / 0.080
G06     40.2           45.0                0.6 +/-    0.85       0.8 +/-    0.85  0.200 / 0.310
G12     310.2          70.6                1.4 +/-    0.58       1.5 +/-    0.58  0.430 / 0.270
G17     87.7           10.0                6.1 +/-    3.31      16.9 +/-    3.31  0.040 / 0.020
G19     77.1           25.6                4.3 +/-    1.83       8.3 +/-    1.83  0.030 / 0.020
G24     228.7          22.2                5.0 +/-    1.87      10.5 +/-    1.87  0.040 / 0.060
G25     317.1          30.2                3.1 +/-    2.18       5.4 +/-    2.18  0.050 / 0.030
G29     288.6          12.5                3.4 +/-    3.52       8.9 +/-    3.52  0.090 / 0.120