PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/25-17:12:40
G01     39.1           12.5                8.1 +/-    1.14      21.2 +/-    1.14  0.090 / 0.310
G06     173.4          44.6               17.6 +/-    1.04      23.9 +/-    1.04  0.110 / 0.360
G13     235.6          19.1               15.6 +/-    2.22      35.1 +/-    2.22  0.050 / 0.160
G15     270.4          10.7               12.9 +/-    2.79      35.4 +/-    2.79  0.070 / 0.150
G17     15.2           65.0               13.1 +/-    0.58      14.2 +/-    0.58  0.100 / 0.240
G19     299.0          72.1               14.3 +/-    0.65      15.0 +/-    0.65  0.090 / 0.190
G24     315.7          21.4               11.0 +/-    3.24      23.3 +/-    3.24  0.030 / 0.040
G28     77.8           44.4               12.9 +/-    0.76      17.5 +/-    0.76  0.030 / 0.040
G30     156.2          25.2               14.8 +/-    2.03      28.8 +/-    2.03  0.130 / 0.170