PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-18:27:50
G07     335.3          58.8               12.5 +/-    0.61      14.4 +/-    0.61  0.040 / 0.020
G08     102.0          53.3               12.5 +/-    0.70      15.1 +/-    0.70  0.030 / 0.020
G09     190.6          71.9               14.9 +/-    0.54      15.6 +/-    0.54  0.080 / 0.100
G11     145.9          14.0               15.3 +/-    2.40      39.0 +/-    2.40  0.060 / 0.100
G23     154.8          35.2               13.5 +/-    0.76      21.4 +/-    0.76  0.040 / 0.020
G27     52.7           30.2               10.6 +/-    1.74      18.5 +/-    1.74  0.040 / 0.020
G28     239.3          31.6               15.2 +/-    2.12      25.8 +/-    2.12  0.100 / 0.090
G30     304.8          38.1               12.9 +/-    1.40      19.3 +/-    1.40  0.100 / 0.040