PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-15:13:00
G01     44.1           19.8                9.6 +/-    1.28      21.3 +/-    1.28  0.080 / 0.080
G06     176.2          33.6               14.5 +/-    1.19      23.6 +/-    1.19  0.070 / 0.100
G13     244.4          25.5               12.0 +/-    1.51      23.3 +/-    1.51  0.150 / 0.310
G15     278.3          13.8                8.0 +/-    1.57      20.6 +/-    1.57  0.130 / 0.310
G17     357.7          73.0               12.9 +/-    0.72      13.4 +/-    0.72  0.110 / 0.210
G19     266.9          68.1               11.8 +/-    0.74      12.6 +/-    0.74  0.080 / 0.210
G24     318.6          13.4                7.7 +/-    1.40      20.0 +/-    1.40  0.070 / 0.150
G28     64.9           49.1               11.4 +/-    0.82      14.5 +/-    0.82  0.070 / 0.150
G30     153.3          34.8               12.5 +/-    1.95      20.0 +/-    1.95  0.030 / 0.030