PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/11/21-13:57:50
G02     70.0           24.7                6.9 +/-    2.83      13.6 +/-    2.83  0.110 / 0.110
G05     47.2           51.2                4.4 +/-    0.67       5.4 +/-    0.67  0.130 / 0.120
G12     181.7          19.0                4.7 +/-    1.00      10.5 +/-    1.00  0.080 / 0.090
G13     116.2          24.0                3.9 +/-    1.37       7.8 +/-    1.37  0.100 / 0.100
G15     158.2          22.3                6.7 +/-    1.10      14.0 +/-    1.10  0.080 / 0.180
G21     283.6          27.2                3.8 +/-    1.04       7.0 +/-    1.04  0.200 / 0.190
G25     214.8          38.9                5.4 +/-    1.69       7.9 +/-    1.69  0.030 / 0.030
G29     339.5          68.8                4.1 +/-    0.60       4.3 +/-    0.60  0.040 / 0.030