PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/26-21:43:00
G02     40.4           49.9                8.1 +/-    0.72      10.3 +/-    0.72  0.040 / 0.060
G05     120.8          69.4                8.9 +/-    0.48       9.4 +/-    0.48  0.060 / 0.060
G12     189.1          53.5                9.2 +/-    1.51      11.2 +/-    1.51  0.040 / 0.060
G20     199.5          39.7               10.2 +/-    1.80      15.0 +/-    1.80  0.040 / 0.050
G25     266.6          60.5                9.3 +/-    0.67      10.5 +/-    0.67  0.050 / 0.070
G29     316.1          38.4                8.4 +/-    1.22      12.6 +/-    1.22  0.040 / 0.080