PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-16:57:50
G03     188.2          16.9               10.3 +/-    1.17      24.5 +/-    1.17  0.050 / 0.090
G07     292.8          38.6                8.1 +/-    1.32      12.1 +/-    1.32  0.050 / 0.070
G08     143.4          29.0               12.8 +/-    0.79      22.8 +/-    0.79  0.030 / 0.050
G09     319.5          65.2                9.5 +/-    1.24      10.4 +/-    1.24  0.030 / 0.040
G16     42.1           34.9                8.1 +/-    0.70      12.9 +/-    0.70  0.040 / 0.100
G23     126.8          71.9               10.8 +/-    0.64      11.3 +/-    0.64  0.050 / 0.070
G27     95.3           34.9                9.6 +/-    0.42      15.3 +/-    0.42  0.050 / 0.110
G30     276.5          15.7                9.2 +/-    1.31      22.5 +/-    1.31  0.060 / 0.130