PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/21-14:28:10
G10     264.3          37.1                5.0 +/-    1.31       7.6 +/-    1.31  0.040 / 0.040
G13     43.1           19.9                3.8 +/-    0.81       8.4 +/-    0.81  0.040 / 0.040
G15     63.0           51.6                5.4 +/-    0.63       6.6 +/-    0.63  0.070 / 0.080
G20     292.9          59.2                5.6 +/-    0.83       6.4 +/-    0.83  0.060 / 0.070
G21     7.4            71.6                4.9 +/-    0.56       5.1 +/-    0.56  0.130 / 0.350
G24     118.7          13.2                9.1 +/-    1.62      23.8 +/-    1.62  0.120 / 0.340
G27     320.8          14.5                2.0 +/-    3.53       5.0 +/-    3.53  0.070 / 0.240
G29     166.3          32.3                8.8 +/-    0.88      14.7 +/-    0.88  0.080 / 0.220