PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/12-20:27:50
G01     116.3          20.0               14.7 +/-    1.32      32.3 +/-    1.32  0.060 / 0.080
G07     87.7           65.2               13.2 +/-    0.38      14.4 +/-    0.38  0.050 / 0.120
G08     44.9           32.7               10.4 +/-    1.53      17.2 +/-    1.53  0.140 / 0.220
G09     177.1          23.4               16.8 +/-    0.92      34.0 +/-    0.92  0.150 / 0.240
G11     105.0          41.2               13.6 +/-    0.70      19.4 +/-    0.70  0.040 / 0.040
G13     316.3          21.5               11.9 +/-    2.09      25.1 +/-    2.09  0.030 / 0.040
G17     203.9          23.8               19.3 +/-    1.34      38.7 +/-    1.34  0.100 / 0.150
G18     91.5           22.0               11.4 +/-    1.92      24.0 +/-    1.92  0.110 / 0.230
G28     299.6          58.8               12.5 +/-    1.02      14.4 +/-    1.02  0.030 / 0.030
G30     359.1          72.5               13.5 +/-    0.28      14.1 +/-    0.28  0.030 / 0.030