PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-15:27:40
G01     86.6           32.2                9.1 +/-    1.77      15.3 +/-    1.77  0.050 / 0.130
G07     128.1          39.4               10.2 +/-    1.01      14.9 +/-    1.01  0.080 / 0.110
G11     63.8           35.7                8.1 +/-    1.09      12.6 +/-    1.09  0.030 / 0.030
G13     293.4          35.6                9.2 +/-    2.13      14.4 +/-    2.13  0.030 / 0.030
G17     216.4          59.0               11.4 +/-    0.62      13.1 +/-    0.62  0.040 / 0.050
G19     215.8          31.5                9.5 +/-    2.67      16.1 +/-    2.67  0.030 / 0.050
G28     354.5          61.3               10.8 +/-    1.14      12.1 +/-    1.14  0.090 / 0.110
G30     106.4          76.3               12.1 +/-    0.53      12.4 +/-    0.53  0.080 / 0.110