PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-20:12:50
G01     56.0           28.7               11.0 +/-    1.20      19.8 +/-    1.20  0.080 / 0.270
G06     180.4          16.2                3.8 +/-   45.70       9.2 +/-   45.70  0.080 / 0.310
G07     142.8          13.0               16.0 +/-    1.61      41.7 +/-    1.61  0.040 / 0.040
G11     46.2           20.2               10.4 +/-    0.78      22.9 +/-    0.78  0.040 / 0.050
G13     257.3          34.5               14.8 +/-    1.14      23.7 +/-    1.14  0.120 / 0.220
G15     289.6          16.6               11.4 +/-    1.06      27.2 +/-    1.06  0.140 / 0.280
G17     275.4          78.7               15.1 +/-    0.38      15.4 +/-    0.38  0.050 / 0.120
G19     236.0          54.3               13.9 +/-    1.50      16.7 +/-    1.50  0.050 / 0.100
G28     34.0           57.9               13.1 +/-    0.67      15.1 +/-    0.67  0.080 / 0.150
G30     145.6          46.7               14.3 +/-    1.01      18.9 +/-    1.01  0.070 / 0.140