PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-17:57:50
G07     321.4          53.1               11.0 +/-    0.59      13.4 +/-    0.59  0.260 / 0.300
G08     117.9          48.8               13.9 +/-    0.52      17.8 +/-    0.52  0.140 / 0.200
G09     220.1          81.2               12.7 +/-    0.60      12.8 +/-    0.60  0.040 / 0.060
G16     44.7           12.4                7.2 +/-    1.51      19.1 +/-    1.51  0.050 / 0.050
G23     150.9          45.5               14.3 +/-    0.67      19.2 +/-    0.67  0.170 / 0.110
G27     62.8           34.8               11.6 +/-    0.80      18.4 +/-    0.80  0.130 / 0.120
G28     231.7          23.6               13.5 +/-    2.08      27.2 +/-    2.08  0.040 / 0.060
G30     296.6          31.4               12.3 +/-    2.04      20.9 +/-    2.04  0.050 / 0.050