PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/17-21:28:00
G03     185.2          10.3               17.4 +/-    2.37      48.2 +/-    2.37  0.040 / 0.090
G07     300.7          43.0               13.3 +/-    1.07      18.4 +/-    1.07  0.050 / 0.100
G08     135.7          35.9               15.7 +/-    1.50      24.4 +/-    1.50  0.050 / 0.170
G09     314.5          72.2               13.1 +/-    0.85      13.7 +/-    0.85  0.060 / 0.170
G16     41.6           29.9                9.8 +/-    0.69      17.2 +/-    0.69  0.040 / 0.080
G23     138.1          67.9               12.8 +/-    0.62      13.7 +/-    0.62  0.040 / 0.080
G27     85.3           36.6               11.6 +/-    1.21      17.9 +/-    1.21  0.030 / 0.070
G30     283.4          22.3               10.9 +/-    1.47      22.6 +/-    1.47  0.040 / 0.060