PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-05:27:50
G01     320.1          14.1                6.0 +/-    2.40      15.3 +/-    2.40  0.030 / 0.020
G08     260.1          15.6                6.6 +/-    2.67      16.3 +/-    2.67  0.030 / 0.010
G10     70.3           56.8                3.2 +/-    1.02       3.7 +/-    1.02  0.140 / 0.110
G11     305.3          22.9                4.5 +/-    2.22       9.3 +/-    2.22  0.160 / 0.100
G14     286.3          70.3                6.0 +/-    0.80       6.3 +/-    0.80  0.150 / 0.490
G18     96.3           34.3                4.9 +/-    0.92       8.0 +/-    0.92  0.150 / 0.440
G21     155.0          10.0                6.4 +/-    1.01      17.8 +/-    1.01  0.030 / 0.010
G27     226.2          11.5                7.9 +/-    3.30      21.4 +/-    3.30  0.040 / 0.010
G31     176.9          36.8                8.8 +/-    1.10      13.6 +/-    1.10  0.150 / 0.090
G32     354.3          71.0                4.2 +/-    0.52       4.4 +/-    0.52  0.170 / 0.150