PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-14:58:00
G01     85.1           32.5                9.9 +/-    1.09      16.5 +/-    1.09  0.040 / 0.060
G07     129.1          38.5               13.2 +/-    1.30      19.6 +/-    1.30  0.030 / 0.050
G11     62.6           35.2               11.8 +/-    1.00      18.7 +/-    1.00  0.020 / 0.020
G13     292.0          35.9               12.6 +/-    1.48      19.6 +/-    1.48  0.020 / 0.030
G17     217.6          60.3               12.1 +/-    1.00      13.7 +/-    1.00  0.060 / 0.100
G19     216.4          32.6               12.3 +/-    2.03      20.4 +/-    2.03  0.060 / 0.100
G28     357.0          61.2               11.7 +/-    0.81      13.2 +/-    0.81  0.060 / 0.040
G30     110.8          75.3               12.2 +/-    1.22      12.6 +/-    1.22  0.050 / 0.050