PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-20:28:00
G02     53.5           38.6               12.7 +/-    0.95      18.9 +/-    0.95  0.070 / 0.070
G05     78.4           70.0               13.1 +/-    0.61      13.8 +/-    0.61  0.090 / 0.060
G12     186.1          38.7               13.4 +/-    0.75      19.9 +/-    0.75  0.130 / 0.350
G13     134.5          10.9                9.5 +/-   16.10      26.0 +/-   16.10  0.110 / 0.330
G20     204.0          54.3               13.5 +/-    1.03      16.2 +/-    1.03  0.070 / 0.050
G21     266.3          13.9               14.0 +/-    2.34      35.6 +/-    2.34  0.040 / 0.060
G25     238.8          55.3               13.6 +/-    4.06      16.1 +/-    4.06  0.030 / 0.030
G29     326.2          51.4               13.9 +/-    0.66      17.2 +/-    0.66  0.020 / 0.020