PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-19:27:50
G01     95.5           29.9               11.8 +/-    0.90      20.7 +/-    0.90  0.030 / 0.030
G07     121.9          43.5               13.5 +/-    1.11      18.5 +/-    1.11  0.030 / 0.030
G08     41.8           11.1               10.7 +/-    1.10      29.1 +/-    1.10  0.030 / 0.060
G11     73.2           41.4               13.1 +/-    0.46      18.6 +/-    0.46  0.030 / 0.060
G13     299.6          35.0               13.2 +/-    1.62      21.0 +/-    1.62  0.040 / 0.060
G17     210.0          48.9               14.8 +/-    1.61      18.9 +/-    1.61  0.040 / 0.070
G18     66.9           23.7               12.0 +/-    0.64      24.2 +/-    0.64  0.080 / 0.160
G19     211.8          22.7               12.5 +/-    1.01      25.7 +/-    1.01  0.090 / 0.200
G28     329.0          61.2               10.4 +/-    1.00      11.7 +/-    1.00  0.060 / 0.120
G30     88.5           77.7               12.5 +/-    0.77      12.8 +/-    0.77  0.060 / 0.140