PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-15:42:40
G03     188.0          20.5               16.8 +/-    1.62      36.5 +/-    1.62  0.190 / 0.410
G07     291.7          41.3               12.3 +/-    1.00      17.6 +/-    1.00  0.260 / 0.340
G08     142.7          25.8               17.2 +/-    1.57      33.0 +/-    1.57  0.050 / 0.100
G09     320.4          58.7               13.6 +/-    0.95      15.6 +/-    0.95  0.040 / 0.090
G16     44.9           44.8               10.4 +/-    0.32      14.1 +/-    0.32  0.130 / 0.240
G23     100.2          81.5               13.0 +/-    0.96      13.1 +/-    0.96  0.130 / 0.310
G26     43.6           16.0                9.0 +/-    1.09      21.9 +/-    1.09  0.040 / 0.080
G27     105.0          32.3               15.8 +/-    1.42      26.5 +/-    1.42  0.040 / 0.070
G30     272.3          12.4               11.7 +/-    2.53      31.1 +/-    2.53  0.080 / 0.100