PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/10/20-17:58:00
G10     245.9          23.0                9.6 +/-    2.38      19.7 +/-    2.38  0.040 / 0.070
G13     58.9           32.4                8.8 +/-    0.67      14.6 +/-    0.67  0.040 / 0.070
G15     105.2          58.8                9.9 +/-    0.57      11.4 +/-    0.57  0.140 / 0.640
G16     301.3          15.4                6.4 +/-    3.78      15.7 +/-    3.78  0.170 / 0.760
G20     262.6          47.0               10.7 +/-    0.91      14.0 +/-    0.91  0.050 / 0.130
G21     328.5          56.9                8.5 +/-    1.17       9.9 +/-    1.17  0.050 / 0.140
G26     274.0          17.4                7.9 +/-    1.17      18.5 +/-    1.17  0.030 / 0.050
G29     162.5          56.4               12.8 +/-    0.96      15.0 +/-    0.96  0.030 / 0.040