PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-18:58:10
G01     95.7           29.8               14.5 +/-    1.02      25.4 +/-    1.02  0.040 / 0.040
G07     121.8          43.4               14.9 +/-    0.68      20.5 +/-    0.68  0.040 / 0.040
G08     41.7           11.5               10.2 +/-    1.22      27.6 +/-    1.22  0.040 / 0.050
G11     73.5           41.5               13.4 +/-    1.37      19.0 +/-    1.37  0.040 / 0.050
G13     299.8          34.9               12.2 +/-    1.37      19.3 +/-    1.37  0.030 / 0.030
G17     210.0          48.5               15.6 +/-    0.49      20.0 +/-    0.49  0.030 / 0.030
G18     67.2           23.8               11.1 +/-    1.41      22.4 +/-    1.41  0.070 / 0.130
G19     211.7          22.6               14.7 +/-    1.50      30.4 +/-    1.50  0.090 / 0.120
G28     328.5          61.1               13.1 +/-    0.85      14.8 +/-    0.85  0.070 / 0.130
G30     88.7           77.6               13.7 +/-    0.56      14.0 +/-    0.56  0.070 / 0.130