PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-12:27:30
G02     54.0           36.8                5.5 +/-    0.86       8.4 +/-    0.86  0.030 / 0.030
G05     75.6           67.5                8.2 +/-    0.38       8.8 +/-    0.38  0.030 / 0.030
G12     188.5          43.1                9.0 +/-    1.62      12.5 +/-    1.62  0.060 / 0.050
G20     205.2          48.0               11.2 +/-    1.65      14.5 +/-    1.65  0.050 / 0.080
G21     266.3          16.8                6.6 +/-    1.61      15.7 +/-    1.61  0.040 / 0.040
G25     251.1          56.6               11.0 +/-    0.55      12.9 +/-    0.55  0.050 / 0.060
G29     325.7          50.5                5.2 +/-    0.96       6.6 +/-    0.96  0.120 / 0.300