PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-14:12:40
G01     115.0          20.5                8.9 +/-    1.37      19.4 +/-    1.37  0.160 / 0.220
G07     94.3           60.9               10.3 +/-    1.13      11.6 +/-    1.13  0.170 / 0.190
G08     43.2           26.0                7.8 +/-    2.76      14.9 +/-    2.76  0.040 / 0.020
G09     175.1          20.4                9.2 +/-    1.90      20.0 +/-    1.90  0.030 / 0.020
G11     97.9           39.5                9.9 +/-    0.54      14.5 +/-    0.54  0.030 / 0.040
G13     316.6          20.9                6.7 +/-    2.06      14.5 +/-    2.06  0.030 / 0.030
G17     202.1          31.3                9.0 +/-    0.95      15.4 +/-    0.95  0.160 / 0.400
G28     300.9          58.7                7.6 +/-    0.91       8.8 +/-    0.91  0.300 / 0.330
G30     349.5          70.1                9.1 +/-    0.88       9.6 +/-    0.88  0.090 / 0.100