PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-18:13:00
G07     55.6           67.3               10.9 +/-    2.05      11.7 +/-    2.05  0.050 / 0.050
G08     54.0           42.4               12.5 +/-   26.57      17.5 +/-   26.57  0.060 / 0.050
G09     179.5          42.5               14.4 +/-    3.37      20.2 +/-    3.37  0.030 / 0.050
G11     121.7          33.3               13.4 +/-    3.16      21.9 +/-    3.16  0.030 / 0.040
G17     198.9          10.8                1.6 +/-   30.79       4.3 +/-   30.79  0.060 / 0.090
G18     105.8          14.3               15.8 +/-   28.04      39.9 +/-   28.04  0.060 / 0.100
G23     160.6          12.1               11.4 +/-    5.25      30.3 +/-    5.25  0.110 / 0.330
G27     38.4           12.4                5.2 +/-   20.89      13.8 +/-   20.89  0.120 / 0.270
G28     265.0          46.6               16.2 +/-   28.88      21.4 +/-   28.88  0.120 / 0.180
G30     329.6          58.2               13.2 +/-   27.52      15.2 +/-   27.52  0.130 / 0.200