PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/29-21:28:10
G02     39.9           50.3                9.3 +/-    0.34      11.6 +/-    0.34  0.040 / 0.070
G05     123.6          69.0                9.6 +/-    0.27      10.2 +/-    0.27  0.040 / 0.080
G12     189.5          54.4               11.1 +/-    1.65      13.4 +/-    1.65  0.040 / 0.050
G20     199.4          38.8               13.5 +/-    2.04      20.1 +/-    2.04  0.040 / 0.040
G25     268.1          60.6               11.1 +/-    0.77      12.5 +/-    0.77  0.040 / 0.050
G29     315.6          37.9                9.8 +/-    0.72      14.7 +/-    0.72  0.040 / 0.050