PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-19:57:50
G10     246.4          23.3               12.5 +/-    2.43      25.4 +/-    2.43  0.050 / 0.070
G13     58.4           32.2                9.9 +/-    1.12      16.6 +/-    1.12  0.050 / 0.070
G15     107.1          59.3               10.8 +/-    0.58      12.4 +/-    0.58  0.170 / 0.500
G16     300.2          15.6                6.3 +/-    1.63      15.4 +/-    1.63  0.140 / 0.540
G20     263.2          47.4               11.7 +/-    0.61      15.3 +/-    0.61  0.050 / 0.130
G21     328.0          56.7                9.1 +/-    0.99      10.7 +/-    0.99  0.060 / 0.110
G26     272.6          17.4               10.5 +/-    3.07      24.6 +/-    3.07  0.030 / 0.050
G29     163.1          56.3               12.1 +/-    0.96      14.3 +/-    0.96  0.030 / 0.040