PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-20:12:50
G01     59.8           30.2               10.3 +/-    1.22      17.9 +/-    1.22  0.030 / 0.050
G07     141.4          16.5               11.9 +/-    1.57      28.5 +/-    1.57  0.040 / 0.050
G11     47.6           23.2                8.9 +/-    2.21      18.0 +/-    2.21  0.110 / 0.150
G13     261.8          36.0               12.8 +/-    0.92      19.9 +/-    0.92  0.090 / 0.200
G15     293.2          16.6                8.4 +/-    2.00      20.0 +/-    2.00  0.040 / 0.060
G17     258.1          76.9               12.3 +/-    0.36      12.6 +/-    0.36  0.040 / 0.050
G18     41.0           11.6                9.2 +/-    3.55      24.9 +/-    3.55  0.080 / 0.110
G19     231.7          50.9               12.9 +/-    1.98      16.0 +/-    1.98  0.060 / 0.150
G28     27.5           58.9                9.3 +/-    0.39      10.7 +/-    0.39  0.220 / 0.420
G30     143.3          50.6               13.2 +/-    0.57      16.6 +/-    0.57  0.220 / 0.380