PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/25-20:12:40
G07     138.8          21.7               14.9 +/-    1.80      31.5 +/-    1.80  0.040 / 0.030
G11     50.5           27.5                9.0 +/-    2.01      16.7 +/-    2.01  0.030 / 0.040
G13     268.9          37.7               15.2 +/-    4.27      23.0 +/-    4.27  0.150 / 0.240
G15     298.5          16.2               12.7 +/-    2.54      30.8 +/-    2.54  0.220 / 0.250
G17     240.1          72.8               16.4 +/-    0.94      17.0 +/-    0.94  0.070 / 0.110
G18     44.7           14.9                9.0 +/-    1.09      22.5 +/-    1.09  0.060 / 0.120
G19     226.3          45.7               16.6 +/-    2.53      22.2 +/-    2.53  0.090 / 0.120
G28     17.3           60.1               13.6 +/-    1.14      15.5 +/-    1.14  0.100 / 0.100
G30     139.0          56.4               15.1 +/-    0.40      17.8 +/-    0.40  0.130 / 0.310