PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-16:27:40
G01     58.7           29.7                9.3 +/-    1.37      16.4 +/-    1.37  0.110 / 0.320
G06     179.6          16.4               13.6 +/-    1.25      32.6 +/-    1.25  0.130 / 0.300
G07     142.3          17.8               10.8 +/-    1.67      25.0 +/-    1.67  0.040 / 0.050
G11     46.9           19.9                8.0 +/-    4.18      17.6 +/-    4.18  0.040 / 0.050
G13     263.4          34.5               13.5 +/-    1.36      21.6 +/-    1.36  0.100 / 0.150
G15     296.6          15.3                7.2 +/-    1.49      17.9 +/-    1.49  0.070 / 0.150
G17     273.0          79.1               12.6 +/-    0.87      12.8 +/-    0.87  0.070 / 0.140
G19     234.6          54.0               13.8 +/-    2.29      16.7 +/-    2.29  0.090 / 0.110
G28     37.6           56.2               12.6 +/-    1.06      14.8 +/-    1.06  0.030 / 0.020
G30     144.2          53.8               12.1 +/-    0.50      14.6 +/-    0.50  0.020 / 0.020