PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-15:58:20
G03     186.1          15.5                9.2 +/-    1.88      22.5 +/-    1.88  0.200 / 0.280
G07     297.6          44.3                9.0 +/-    0.84      12.3 +/-    0.84  0.200 / 0.290
G08     138.8          30.3               11.3 +/-    1.32      19.7 +/-    1.32  0.050 / 0.070
G09     319.7          64.2                7.9 +/-    1.30       8.7 +/-    1.30  0.040 / 0.080
G16     43.0           39.7                5.9 +/-    0.58       8.7 +/-    0.58  0.130 / 0.390
G23     123.3          77.1                9.6 +/-    0.53       9.8 +/-    0.53  0.110 / 0.320
G26     44.2           11.5                8.2 +/-    2.00      22.1 +/-    2.00  0.050 / 0.090
G27     98.6           34.7                9.7 +/-    0.70      15.5 +/-    0.70  0.050 / 0.090
G30     276.4          15.6                9.0 +/-    1.16      22.1 +/-    1.16  0.050 / 0.100