PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/28-13:57:50
G10     263.2          36.4                4.8 +/-    1.64       7.4 +/-    1.64  0.040 / 0.030
G13     43.6           20.6                5.0 +/-    3.80      10.9 +/-    3.80  0.040 / 0.040
G15     64.2           52.1                2.7 +/-    0.49       3.3 +/-    0.49  0.080 / 0.070
G16     284.7          13.0               -0.1 +/-    2.25      -0.3 +/-    2.25  0.090 / 0.080
G20     291.1          58.7                4.0 +/-    0.71       4.6 +/-    0.71  0.130 / 0.400
G21     5.9            71.2                2.5 +/-    0.32       2.7 +/-    0.32  0.140 / 0.420
G24     119.8          12.5                7.4 +/-    1.93      19.5 +/-    1.93  0.110 / 0.230
G27     321.2          13.6                0.3 +/-    2.23       0.8 +/-    2.23  0.100 / 0.240
G29     166.0          33.2                5.4 +/-    0.72       8.9 +/-    0.72  0.190 / 0.280