PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-18:13:10
G07     56.8           67.2               12.0 +/-    0.79      12.9 +/-    0.79  0.040 / 0.050
G08     53.6           42.1               11.8 +/-    1.22      16.6 +/-    1.22  0.040 / 0.030
G09     179.5          42.0               14.2 +/-    0.63      20.1 +/-    0.63  0.030 / 0.030
G11     121.3          33.6               13.9 +/-    0.81      22.6 +/-    0.81  0.030 / 0.040
G17     198.9          11.2               -2.8 +/-   25.32      -7.5 +/-   25.32  0.120 / 0.120
G18     105.4          14.6               14.2 +/-    3.05      35.8 +/-    3.05  0.120 / 0.130
G23     160.6          11.7               12.5 +/-    2.24      33.7 +/-    2.24  0.140 / 0.350
G27     38.3           12.1                9.4 +/-    1.99      25.1 +/-    1.99  0.180 / 0.430
G28     265.6          46.9               14.7 +/-    4.58      19.3 +/-    4.58  0.140 / 0.190
G30     330.1          58.6               12.6 +/-    0.63      14.5 +/-    0.63  0.110 / 0.210