PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-19:43:00
G01     87.4           31.9               12.3 +/-    1.02      20.8 +/-    1.02  0.030 / 0.040
G07     127.8          37.5               13.5 +/-    1.08      20.5 +/-    1.08  0.030 / 0.030
G11     65.0           38.7               10.9 +/-    1.00      16.3 +/-    1.00  0.040 / 0.090
G13     291.7          37.4               12.1 +/-    1.37      18.4 +/-    1.37  0.030 / 0.070
G15     313.4          11.3               10.5 +/-    5.22      28.6 +/-    5.22  0.050 / 0.050
G17     214.9          56.0               14.9 +/-    1.32      17.5 +/-    1.32  0.040 / 0.060
G18     59.8           22.4               10.4 +/-    1.08      21.6 +/-    1.08  0.070 / 0.210
G19     214.8          29.1               13.9 +/-    1.26      24.7 +/-    1.26  0.070 / 0.200
G28     342.9          61.6               10.4 +/-    0.48      11.6 +/-    0.48  0.070 / 0.140
G30     112.7          73.0               12.9 +/-    0.88      13.5 +/-    0.88  0.070 / 0.140