PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-22:58:00
G02     213.0          57.1               15.0 +/-    0.71      17.5 +/-    0.71  0.060 / 0.080
G06     79.5           79.7               13.7 +/-    0.37      13.9 +/-    0.37  0.070 / 0.090
G12     316.1          30.0               11.0 +/-    1.39      19.3 +/-    1.39  0.030 / 0.030
G17     54.3           34.2               10.9 +/-    0.56      17.6 +/-    0.56  0.030 / 0.030
G19     34.9           51.3               12.2 +/-    0.51      15.2 +/-    0.51  0.080 / 0.190
G24     269.0          42.4               13.1 +/-    0.76      18.3 +/-    0.76  0.090 / 0.190
G28     118.5          20.4               15.8 +/-    0.62      34.5 +/-    0.62  0.040 / 0.060