PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-17:58:00
G07     316.7          51.0               12.4 +/-    1.15      15.4 +/-    1.15  0.060 / 0.020
G08     123.1          46.4               14.4 +/-    0.64      19.0 +/-    0.64  0.060 / 0.020
G09     249.0          82.7               14.3 +/-    0.56      14.4 +/-    0.56  0.050 / 0.060
G16     43.7           15.5                8.1 +/-    2.40      19.9 +/-    2.40  0.050 / 0.060
G23     149.0          49.6               13.7 +/-    0.76      17.3 +/-    0.76  0.210 / 0.380
G27     67.2           35.9               10.2 +/-    0.78      15.9 +/-    0.78  0.180 / 0.350
G28     229.2          20.5               15.3 +/-    1.59      33.3 +/-    1.59  0.040 / 0.030
G30     293.7          29.1               11.4 +/-    2.00      20.4 +/-    2.00  0.050 / 0.030