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                6.1 +/-    1.04      15.5 +/-    1.04  0.030 / 0.010
G08     260.1          15.6                8.0 +/-    2.19      19.5 +/-    2.19  0.030 / 0.010
G10     70.3           56.8                4.3 +/-    0.84       5.0 +/-    0.84  0.210 / 0.470
G11     305.3          22.9                6.5 +/-    1.70      13.3 +/-    1.70  0.130 / 0.470
G14     286.3          70.3                5.2 +/-    0.63       5.5 +/-    0.63  0.120 / 0.210
G18     96.3           34.3                5.3 +/-    1.13       8.6 +/-    1.13  0.170 / 0.150
G21     155.0          10.0                7.9 +/-    4.80      22.0 +/-    4.80  0.030 / 0.010
G27     226.2          11.5                9.3 +/-    1.33      25.1 +/-    1.33  0.030 / 0.010
G31     176.9          36.8                8.3 +/-    1.87      12.7 +/-    1.87  0.190 / 0.120
G32     354.3          71.0                1.8 +/-    0.63       1.9 +/-    0.63  0.200 / 0.160