PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-16:12:40
G02     203.4          30.2               15.5 +/-    1.29      27.1 +/-    1.29  0.060 / 0.070
G03     60.9           9.8                 7.8 +/-    1.73      22.0 +/-    1.73  0.060 / 0.090
G06     162.4          67.1               11.2 +/-    0.55      12.1 +/-    0.55  0.080 / 0.220
G12     307.0          14.4                7.6 +/-    2.93      19.2 +/-    2.93  0.080 / 0.200
G17     37.1           48.3                9.7 +/-    1.83      12.5 +/-    1.83  0.060 / 0.040
G19     3.0            65.3               10.2 +/-    0.84      11.1 +/-    0.84  0.030 / 0.040
G24     301.7          36.0                9.5 +/-    1.04      14.8 +/-    1.04  0.090 / 0.230
G28     101.2          32.0               10.9 +/-    1.37      18.3 +/-    1.37  0.100 / 0.270