PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-19:12:40
G10     246.9          25.3               12.3 +/-    0.85      23.9 +/-    0.85  0.040 / 0.060
G13     57.1           30.9                9.3 +/-    1.54      16.0 +/-    1.54  0.030 / 0.050
G15     96.0           58.0               10.7 +/-    1.29      12.3 +/-    1.29  0.060 / 0.130
G20     265.3          48.9               11.3 +/-    4.23      14.4 +/-    4.23  0.070 / 0.190
G21     328.3          56.3                9.9 +/-    0.80      11.7 +/-    0.80  0.030 / 0.040
G26     272.3          17.1               10.1 +/-    3.16      23.9 +/-    3.16  0.030 / 0.040
G29     162.2          55.8               11.9 +/-    0.56      14.1 +/-    0.56  0.170 / 0.190