PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/22-19:12:50
G07     44.2           69.9               13.1 +/-    0.54      13.8 +/-    0.54  0.230 / 0.170
G08     54.6           44.7               10.9 +/-    0.80      14.8 +/-    0.80  0.040 / 0.050
G09     179.0          39.0               14.9 +/-    1.12      22.0 +/-    1.12  0.050 / 0.050
G11     122.5          33.6               15.4 +/-    1.07      25.1 +/-    1.07  0.040 / 0.080
G18     106.4          15.5               15.2 +/-    0.81      37.4 +/-    0.81  0.030 / 0.040
G28     273.3          52.0               13.5 +/-    0.90      16.6 +/-    0.90  0.040 / 0.040
G30     332.7          60.0               12.6 +/-    1.27      14.4 +/-    1.27  0.090 / 0.110