PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-20:27:40
G02     357.5          74.4                8.6 +/-    0.28       8.9 +/-    0.28  0.040 / 0.030
G05     163.3          40.5               11.9 +/-    1.18      17.2 +/-    1.18  0.040 / 0.040
G06     44.9           31.6                7.6 +/-    1.56      12.8 +/-    1.56  0.080 / 0.070
G12     275.9          79.7               11.0 +/-    0.64      11.2 +/-    0.64  0.070 / 0.070
G19     84.7           20.0                9.6 +/-    0.99      21.1 +/-    0.99  0.150 / 0.260
G24     223.0          16.9               13.3 +/-    2.88      31.7 +/-    2.88  0.150 / 0.300
G25     313.3          42.1               10.0 +/-    1.23      14.0 +/-    1.23  0.030 / 0.020
G29     293.7          15.6                8.0 +/-    1.94      19.6 +/-    1.94  0.020 / 0.020