PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/20-09:57:40
G10     255.0          31.0                3.8 +/-    1.65       6.4 +/-    1.65  0.050 / 0.040
G13     49.1           26.3                3.0 +/-    2.26       5.6 +/-    2.26  0.040 / 0.040
G15     75.8           55.6                3.0 +/-    0.72       3.5 +/-    0.72  0.100 / 0.120
G16     295.4          13.8                1.3 +/-    1.75       3.4 +/-    1.75  0.110 / 0.110
G20     277.3          54.2                3.9 +/-    3.12       4.7 +/-    3.12  0.090 / 0.380
G21     350.1          66.5                3.3 +/-    0.60       3.6 +/-    0.60  0.080 / 0.370
G26     269.0          13.1                1.8 +/-    3.30       4.6 +/-    3.30  0.080 / 0.140
G29     163.1          40.2                6.7 +/-    0.86       9.8 +/-    0.86  0.200 / 0.180