PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/22-18:42:50
G01     117.8          18.1               12.1 +/-    1.52      27.9 +/-    1.52  0.030 / 0.070
G07     91.6           60.6               11.4 +/-    0.99      12.9 +/-    0.99  0.040 / 0.060
G08     44.4           30.1                8.6 +/-    0.65      15.0 +/-    0.65  0.020 / 0.050
G09     177.5          26.4               12.5 +/-    1.34      23.6 +/-    1.34  0.030 / 0.050
G11     103.9          40.9               12.4 +/-    0.68      17.8 +/-    0.68  0.040 / 0.030
G13     316.9          20.9                9.6 +/-    2.15      20.7 +/-    2.15  0.030 / 0.030
G17     201.1          25.9               13.5 +/-    1.39      25.9 +/-    1.39  0.110 / 0.310
G18     91.0           21.0               11.5 +/-    1.22      24.8 +/-    1.22  0.120 / 0.420
G28     287.5          54.8               12.5 +/-    0.68      14.9 +/-    0.68  0.070 / 0.190
G30     352.1          70.7               11.1 +/-    0.77      11.7 +/-    0.77  0.080 / 0.210