PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-19:13:10
G02     22.8           63.4                9.9 +/-    1.15      10.9 +/-    1.15  0.040 / 0.060
G05     157.1          52.6               11.7 +/-    1.09      14.3 +/-    1.09  0.040 / 0.060
G06     50.2           21.6                7.3 +/-    0.86      15.4 +/-    0.86  0.020 / 0.040
G12     212.6          74.9               10.3 +/-    0.78      10.6 +/-    0.78  0.030 / 0.030
G19     95.2           12.5                8.8 +/-    1.99      23.4 +/-    1.99  0.090 / 0.130
G20     197.3          20.0               11.7 +/-    2.43      25.8 +/-    2.43  0.060 / 0.150
G25     302.9          52.3               11.0 +/-    0.62      13.5 +/-    0.62  0.030 / 0.050
G29     303.3          24.9               11.2 +/-    0.70      21.9 +/-    0.70  0.030 / 0.050