PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-07:58:00
G01     253.6          36.6                5.5 +/-    0.96       8.5 +/-    0.96  0.210 / 0.370
G03     316.2          39.0                3.9 +/-    1.64       5.8 +/-    1.64  0.080 / 0.320
G11     236.4          14.4                6.2 +/-    1.72      15.7 +/-    1.72  0.060 / 0.080
G14     59.1           40.8                4.0 +/-    0.65       5.8 +/-    0.65  0.060 / 0.080
G16     164.7          15.8                7.2 +/-    2.72      17.5 +/-    2.72  0.190 / 0.350
G22     307.4          65.2                4.6 +/-    0.74       5.0 +/-    0.74  0.150 / 0.280
G23     284.2          16.8                5.7 +/-    3.14      13.6 +/-    3.14  0.070 / 0.140
G26     139.6          35.4                7.7 +/-    0.70      12.2 +/-    0.70  0.070 / 0.120
G31     41.3           61.0                3.7 +/-    0.63       4.2 +/-    0.63  0.040 / 0.050
G32     74.9           25.0                4.6 +/-    0.59       8.9 +/-    0.59  0.030 / 0.040