PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-12:13:00
G07     311.7825       49.5753          3.4502 +/-  0.6705    4.3741 +/-  0.6705  0.030 / 0.020
G08     123.7746       41.8595          4.3282 +/-  0.7521    6.1114 +/-  0.7521  0.020 / 0.020
G09     296.0567       81.5638          4.1526 +/-  0.8927    4.1933 +/-  0.8927  0.060 / 0.050
G16     41.9232        24.2849          4.2399 +/-  1.6799    8.4224 +/-  1.6799  0.040 / 0.040
G23     144.8885       64.0466          4.5740 +/-  0.5005    5.0270 +/-  0.5005  0.040 / 0.040
G27     76.4447        36.6526          4.4539 +/-  0.8033    6.8590 +/-  0.8033  0.030 / 0.040
G28     224.7738       13.6610          3.4021 +/-  2.5910    8.7389 +/-  2.5910  0.040 / 0.060
G30     285.3587       20.6511          4.6213 +/-  2.7251   10.0084 +/-  2.7251  0.050 / 0.060