PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-20:12:50
G01     110.6          23.7               14.0 +/-    2.40      28.2 +/-    2.40  0.110 / 0.210
G07     100.4          61.3               12.9 +/-    0.54      14.5 +/-    0.54  0.110 / 0.230
G08     43.0           26.9               11.1 +/-    1.65      20.7 +/-    1.65  0.060 / 0.210
G09     176.0          17.4               15.8 +/-    2.08      37.1 +/-    2.08  0.070 / 0.230
G11     96.2           42.8               15.1 +/-    0.83      21.0 +/-    0.83  0.040 / 0.060
G13     312.5          26.0               14.1 +/-    1.13      26.9 +/-    1.13  0.040 / 0.070
G17     205.9          29.5               15.6 +/-    1.85      27.6 +/-    1.85  0.030 / 0.040
G18     84.8           23.7               12.2 +/-    1.06      24.6 +/-    1.06  0.030 / 0.050
G28     311.6          60.4               13.8 +/-    1.00      15.6 +/-    1.00  0.040 / 0.070
G30     17.4           76.6               13.8 +/-    0.58      14.1 +/-    0.58  0.040 / 0.080