PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-05:42:50
G01     318.1          19.7                6.2 +/-    1.96      13.7 +/-    1.96  0.030 / 0.010
G08     254.1          12.2                8.9 +/-    5.41      23.7 +/-    5.41  0.030 / 0.020
G10     81.5           53.3                5.3 +/-    0.80       6.4 +/-    0.80  0.160 / 0.170
G11     299.3          26.1                4.5 +/-    3.71       8.7 +/-    3.71  0.100 / 0.250
G14     308.2          71.6                4.4 +/-    0.70       4.6 +/-    0.70  0.100 / 0.240
G18     102.4          29.7                6.5 +/-    0.91      11.4 +/-    0.91  0.200 / 0.170
G22     301.5          13.0                6.6 +/-    3.33      17.2 +/-    3.33  0.040 / 0.010
G31     175.3          44.2                7.2 +/-    1.10       9.8 +/-    1.10  0.050 / 0.010
G32     9.3            66.5                2.6 +/-    0.42       2.8 +/-    0.42  0.050 / 0.050