PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-14:12:50
G01     103.0          27.5                9.9 +/-    1.20      18.3 +/-    1.20  0.030 / 0.020
G07     112.6          55.2               10.9 +/-    0.60      13.0 +/-    0.60  0.030 / 0.020
G08     41.6           16.4                7.4 +/-    2.31      17.9 +/-    2.31  0.030 / 0.040
G11     82.7           42.4               10.9 +/-    0.90      15.3 +/-    0.90  0.030 / 0.040
G13     306.2          31.1                9.9 +/-    1.30      16.9 +/-    1.30  0.060 / 0.120
G17     207.5          41.9               11.2 +/-    0.75      15.8 +/-    0.75  0.080 / 0.130
G18     75.7           24.6               10.3 +/-    2.20      20.3 +/-    2.20  0.090 / 0.130
G19     210.6          13.9                3.9 +/-   11.68       9.8 +/-   11.68  0.100 / 0.150
G28     325.5          61.5                8.7 +/-    0.88       9.7 +/-    0.88  0.060 / 0.120
G30     38.5           79.7               10.3 +/-    0.36      10.5 +/-    0.36  0.070 / 0.120