PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-17:27:40
G02     52.4           39.8                8.0 +/-    0.86      11.6 +/-    0.86  0.030 / 0.040
G05     73.4           68.3                4.5 +/-    1.24       4.8 +/-    1.24  0.020 / 0.040
G12     183.5          36.7                8.9 +/-    1.36      13.8 +/-    1.36  0.110 / 0.270
G13     132.3          11.2                8.3 +/-   17.80      22.6 +/-   17.80  0.110 / 0.270
G21     266.8          13.7                6.1 +/-    2.22      15.7 +/-    2.22  0.040 / 0.080
G25     242.1          55.4                7.9 +/-    1.16       9.4 +/-    1.16  0.080 / 0.080
G29     324.2          48.4                5.8 +/-    1.72       7.4 +/-    1.72  0.240 / 0.460