PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-15:12:30
G01     85.8           32.3                7.6 +/-    0.95      12.8 +/-    0.95  0.020 / 0.020
G07     128.6          39.0                9.9 +/-    1.36      14.7 +/-    1.36  0.030 / 0.020
G11     63.2           35.5                9.7 +/-    0.86      15.2 +/-    0.86  0.050 / 0.050
G13     292.7          35.8               10.1 +/-    1.51      15.8 +/-    1.51  0.040 / 0.060
G17     217.0          59.6                8.8 +/-    0.95      10.0 +/-    0.95  0.070 / 0.100
G19     216.1          32.1                8.9 +/-    1.65      15.0 +/-    1.65  0.070 / 0.100
G28     355.8          61.3                9.5 +/-    0.77      10.6 +/-    0.77  0.050 / 0.040
G30     108.7          75.8               10.5 +/-    0.72      10.7 +/-    0.72  0.050 / 0.080