PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-19:43:10
G02     36.7           52.9               11.9 +/-    0.56      14.5 +/-    0.56  0.030 / 0.050
G05     139.6          65.4               12.5 +/-    1.16      13.6 +/-    1.16  0.040 / 0.060
G06     57.4           11.6                9.0 +/-    1.23      24.2 +/-    1.23  0.030 / 0.040
G12     193.2          60.6               11.9 +/-    0.91      13.5 +/-    0.91  0.030 / 0.050
G20     198.7          33.3               14.0 +/-    0.99      22.9 +/-    0.99  0.060 / 0.110
G25     280.2          59.6               13.5 +/-    0.69      15.4 +/-    0.69  0.060 / 0.100
G29     312.8          34.8               11.7 +/-    1.43      18.6 +/-    1.43  0.030 / 0.040