PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-12:27:30
G08     117.7253       45.1214          6.7521 +/-  1.3199    9.0829 +/-  1.3199  0.030 / 0.060
G09     255.6044       83.9993          4.2400 +/-  0.7803    4.2610 +/-  0.7803  0.040 / 0.050
G16     42.7371        19.9034          4.1845 +/-  1.6930    9.2289 +/-  1.6930  0.100 / 0.130
G23     148.7024       58.6488          7.1713 +/-  0.7256    8.2436 +/-  0.7256  0.100 / 0.140
G27     70.1080        36.0602          3.5826 +/-  0.6839    5.5762 +/-  0.6839  0.120 / 0.200
G28     227.5623       17.8560          3.1644 +/-  3.0302    7.3389 +/-  3.0302  0.100 / 0.260
G30     289.2126       23.6959          4.6591 +/-  1.3855    9.3829 +/-  1.3855  0.030 / 0.030