PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-16:58:00
G03     188.2          16.9               11.0 +/-    3.25      26.1 +/-    3.25  0.090 / 0.080
G07     292.8          38.6                8.7 +/-    1.80      13.0 +/-    1.80  0.090 / 0.100
G08     143.4          29.0               12.3 +/-    0.69      21.9 +/-    0.69  0.080 / 0.130
G09     319.5          65.2                9.5 +/-    1.25      10.3 +/-    1.25  0.070 / 0.110
G16     42.1           34.9                8.4 +/-    1.00      13.3 +/-    1.00  0.030 / 0.030
G23     126.8          71.9               10.1 +/-    0.66      10.6 +/-    0.66  0.020 / 0.030
G27     95.3           34.9               10.7 +/-    1.23      17.0 +/-    1.23  0.110 / 0.120
G30     276.5          15.7                7.3 +/-    1.68      17.7 +/-    1.68  0.130 / 0.130