PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/12/17-13:28:10
G10     256.6          33.3                4.1 +/-    2.11       6.8 +/-    2.11  0.040 / 0.040
G13     47.6           24.5                4.7 +/-    1.73       9.2 +/-    1.73  0.040 / 0.040
G15     69.1           52.4                4.4 +/-    0.39       5.3 +/-    0.39  0.030 / 0.050
G20     283.9          57.7                5.5 +/-    1.97       6.4 +/-    1.97  0.040 / 0.050
G21     345.9          65.3                3.9 +/-    0.45       4.3 +/-    0.45  0.100 / 0.150
G26     262.9          12.7                4.2 +/-    0.91      11.1 +/-    0.91  0.080 / 0.110
G29     165.5          43.9                6.7 +/-    0.79       9.1 +/-    0.79  0.100 / 0.130