PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-13:12:30
G07     353.9474       63.6071          5.3787 +/-  0.7884    5.9309 +/-  0.7884  0.060 / 0.080
G08     81.7891        51.3486          6.1358 +/-  0.5650    7.6136 +/-  0.5650  0.070 / 0.100
G09     180.9837       63.5620          7.7393 +/-  1.1384    8.5369 +/-  1.1384  0.080 / 0.350
G11     137.5006       18.1336          7.5560 +/-  1.7737   17.4044 +/-  1.7737  0.150 / 0.450
G23     158.0634       34.6140          7.5029 +/-  1.9919   11.9930 +/-  1.9919  0.030 / 0.040
G27     47.6562        25.9786          7.6561 +/-  1.7390   14.6301 +/-  1.7390  0.040 / 0.050
G28     244.5864       35.8660          6.5248 +/-  1.4344   10.1914 +/-  1.4344  0.040 / 0.100
G30     306.9429       38.3846          5.2626 +/-  0.8883    7.8635 +/-  0.8883  0.050 / 0.090