PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-17:57:40
G07     321.4          53.1               11.0 +/-    1.75      13.4 +/-    1.75  0.050 / 0.070
G08     117.9          48.8               14.9 +/-    1.59      19.1 +/-    1.59  0.050 / 0.080
G09     220.1          81.2               12.6 +/-    0.49      12.7 +/-    0.49  0.060 / 0.060
G16     44.7           12.4                7.6 +/-    0.73      20.0 +/-    0.73  0.030 / 0.070
G23     150.9          45.5               13.4 +/-    1.00      17.9 +/-    1.00  0.100 / 0.280
G27     62.8           34.8               10.7 +/-    0.48      17.1 +/-    0.48  0.110 / 0.320
G28     231.7          23.6               15.9 +/-    1.62      32.1 +/-    1.62  0.040 / 0.060
G30     296.6          31.4               10.2 +/-    1.16      17.3 +/-    1.16  0.030 / 0.070