PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-20:27:50
G01     62.6           31.1               11.1 +/-    0.81      18.9 +/-    0.81  0.040 / 0.040
G07     140.3          18.9               14.1 +/-    1.29      31.9 +/-    1.29  0.040 / 0.050
G11     48.8           25.1               10.7 +/-    1.19      20.9 +/-    1.19  0.080 / 0.270
G13     265.0          36.8               15.3 +/-    1.25      23.5 +/-    1.25  0.080 / 0.330
G15     295.6          16.5               10.9 +/-    1.83      26.1 +/-    1.83  0.040 / 0.060
G17     249.2          75.4               14.3 +/-    0.99      14.7 +/-    0.99  0.040 / 0.070
G18     42.5           13.1                9.0 +/-    1.12      23.5 +/-    1.12  0.070 / 0.220
G19     229.2          48.5               15.1 +/-    1.03      19.5 +/-    1.03  0.090 / 0.220
G28     23.1           59.4               11.0 +/-    0.41      12.6 +/-    0.41  0.060 / 0.110
G30     141.5          53.3               12.0 +/-    1.02      14.6 +/-    1.02  0.050 / 0.100