PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/26-13:43:10
G01     127.4          11.2                1.2 +/-   37.50       3.2 +/-   37.50  0.140 / 0.330
G07     58.9           67.6               13.1 +/-   14.28      14.0 +/-   14.28  0.170 / 0.300
G08     50.3           38.4               -0.1 +/-   11.84      -0.2 +/-   11.84  0.030 / 0.050
G09     176.8          35.6                3.6 +/-   14.03       5.7 +/-   14.03  0.030 / 0.050
G11     115.9          33.6               12.1 +/-   11.67      19.7 +/-   11.67  0.170 / 0.180
G17     199.1          16.3                7.9 +/-    3.27      19.1 +/-    3.27  0.140 / 0.150
G23     161.0          9.7                 6.4 +/-    1.76      17.8 +/-    1.76  0.210 / 0.280
G28     275.3          52.4              -20.5 +/-   56.25     -25.2 +/-   56.25  0.170 / 0.330
G30     329.4          57.6                4.5 +/-    0.72       5.3 +/-    0.72  0.040 / 0.040