PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/07-14:27:50
G01     85.9           32.4                9.3 +/-    0.81      15.5 +/-    0.81  0.080 / 0.120
G07     128.6          39.3               10.9 +/-    0.97      16.1 +/-    0.97  0.080 / 0.120
G11     63.3           35.7                7.3 +/-    0.93      11.4 +/-    0.93  0.030 / 0.040
G13     292.8          35.7                9.0 +/-    1.01      14.0 +/-    1.01  0.030 / 0.040
G17     217.0          59.6               12.8 +/-    0.51      14.6 +/-    0.51  0.030 / 0.070
G19     216.1          32.0               10.6 +/-    0.90      17.9 +/-    0.90  0.030 / 0.070
G28     355.9          61.3                8.7 +/-    0.75       9.8 +/-    0.75  0.030 / 0.030
G30     109.0          75.7               10.3 +/-    0.47      10.5 +/-    0.47  0.030 / 0.030