PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/23-07:27:50
G01     74.1           33.1                4.6 +/-    0.87       7.6 +/-    0.87  0.040 / 0.040
G07     135.7          32.7                7.9 +/-    1.43      13.1 +/-    1.43  0.040 / 0.050
G11     56.0           32.1                3.8 +/-    1.12       6.4 +/-    1.12  0.040 / 0.070
G13     279.9          37.1                4.6 +/-    1.33       7.0 +/-    1.33  0.050 / 0.070
G15     304.8          15.0                1.1 +/-    2.57       2.7 +/-    2.57  0.040 / 0.020
G17     229.5          68.1                7.1 +/-    0.67       7.6 +/-    0.67  0.030 / 0.020
G19     222.3          40.9                7.3 +/-    1.57      10.5 +/-    1.57  0.090 / 0.200
G28     15.8           59.6                4.3 +/-    0.68       4.9 +/-    0.68  0.100 / 0.190
G30     131.6          63.7                7.7 +/-    0.60       8.5 +/-    0.60  0.070 / 0.090