PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-15:58:00
G01     72.1           32.8                7.3 +/-    1.78      12.1 +/-    1.78  0.130 / 0.260
G07     136.4          28.6               10.5 +/-    0.70      18.9 +/-    0.70  0.080 / 0.210
G11     53.4           28.7                8.0 +/-    1.94      14.4 +/-    1.94  0.080 / 0.100
G13     278.4          37.0                7.5 +/-    2.53      11.4 +/-    2.53  0.070 / 0.100
G15     307.1          13.3                7.8 +/-    2.64      20.3 +/-    2.64  0.040 / 0.030
G17     232.3          70.6                9.4 +/-    0.57       9.9 +/-    0.57  0.040 / 0.030
G19     223.3          42.9                9.2 +/-    1.91      12.9 +/-    1.91  0.080 / 0.090
G28     17.1           59.5                9.5 +/-    0.62      10.8 +/-    0.62  0.070 / 0.090
G30     132.5          65.8                9.9 +/-    0.71      10.7 +/-    0.71  0.080 / 0.090