PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-20:58:10
G03     187.8          16.7               11.3 +/-    1.74      26.9 +/-    1.74  0.060 / 0.080
G07     292.8          38.7                9.5 +/-    2.21      14.2 +/-    2.21  0.090 / 0.100
G08     141.9          29.5               11.7 +/-    1.45      20.7 +/-    1.45  0.090 / 0.090
G09     319.5          64.5               10.7 +/-    0.42      11.7 +/-    0.42  0.070 / 0.110
G16     42.2           36.9                9.0 +/-    0.76      13.8 +/-    0.76  0.060 / 0.080
G23     124.7          75.3               10.3 +/-    0.69      10.6 +/-    0.69  0.060 / 0.060
G27     95.0           34.8               10.8 +/-    1.54      17.3 +/-    1.54  0.040 / 0.110
G30     277.3          17.6               10.8 +/-    2.23      25.3 +/-    2.23  0.090 / 0.150