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                9.1 +/-    1.14      16.1 +/-    1.14  0.080 / 0.150
G06     179.6          16.4               13.7 +/-    3.25      32.9 +/-    3.25  0.090 / 0.140
G07     142.3          17.8                9.3 +/-    2.21      21.5 +/-    2.21  0.120 / 0.250
G11     46.9           19.9                7.6 +/-    2.83      16.7 +/-    2.83  0.110 / 0.250
G13     263.4          34.5               11.9 +/-    1.47      19.1 +/-    1.47  0.030 / 0.040
G15     296.6          15.3                9.3 +/-    2.93      23.0 +/-    2.93  0.020 / 0.030
G17     273.0          79.1               12.3 +/-    1.32      12.5 +/-    1.32  0.170 / 0.300
G19     234.6          54.0               12.1 +/-    2.22      14.6 +/-    2.22  0.160 / 0.340
G28     37.6           56.2                9.0 +/-    0.79      10.6 +/-    0.79  0.040 / 0.040
G30     144.2          53.8               11.5 +/-    1.09      13.9 +/-    1.09  0.040 / 0.060