PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-14:57:40
G01     46.1           21.9                7.9 +/-    0.47      16.6 +/-    0.47  0.210 / 0.330
G06     176.9          30.3               14.6 +/-    1.76      25.3 +/-    1.76  0.210 / 0.330
G13     247.4          27.4                9.7 +/-    2.02      18.0 +/-    2.02  0.080 / 0.180
G15     281.1          14.5                6.9 +/-    1.15      17.3 +/-    1.15  0.070 / 0.150
G17     349.4          75.3                9.8 +/-    0.46      10.1 +/-    0.46  0.060 / 0.090
G19     259.3          66.1                8.1 +/-    0.81       8.8 +/-    0.81  0.060 / 0.070
G24     319.1          10.9              -10.9 +/-   29.47     -29.9 +/-   29.47  0.050 / 0.150
G28     60.6           50.5                8.9 +/-    0.66      11.2 +/-    0.66  0.060 / 0.160
G30     152.1          37.9               11.9 +/-    0.56      17.8 +/-    0.56  0.020 / 0.030