PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/12/13-13:42:50
G10     255.6          32.6                5.1 +/-    2.62       8.5 +/-    2.62  0.130 / 0.330
G13     48.3           25.2                6.3 +/-    2.13      12.2 +/-    2.13  0.170 / 0.440
G15     70.9           53.1                6.5 +/-    0.41       7.9 +/-    0.41  0.040 / 0.040
G16     289.6          15.5                4.5 +/-    1.59      11.0 +/-    1.59  0.040 / 0.040
G20     282.0          57.0                6.4 +/-    2.21       7.4 +/-    2.21  0.040 / 0.050
G21     343.9          64.4                4.6 +/-    0.54       5.0 +/-    0.54  0.030 / 0.050
G26     263.8          13.2                2.8 +/-    1.64       7.2 +/-    1.64  0.120 / 0.110
G29     165.3          45.1                8.1 +/-    0.93      10.9 +/-    0.93  0.060 / 0.110