PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-20:28:00
G01     49.8           25.2               12.4 +/-    1.17      24.0 +/-    1.17  0.030 / 0.050
G06     179.0          22.7               15.7 +/-    2.68      32.5 +/-    2.68  0.030 / 0.050
G11     44.3           14.6               10.9 +/-    2.56      27.4 +/-    2.56  0.130 / 0.330
G13     249.8          31.1               15.2 +/-    1.38      26.0 +/-    1.38  0.120 / 0.320
G15     283.0          15.9               12.8 +/-    1.99      31.2 +/-    1.99  0.060 / 0.130
G17     314.7          79.0               13.7 +/-    1.04      13.9 +/-    1.04  0.060 / 0.110
G19     245.6          60.2               14.5 +/-    0.69      16.4 +/-    0.69  0.090 / 0.150
G28     45.5           55.8               12.8 +/-    0.61      15.2 +/-    0.61  0.080 / 0.160
G30     149.1          39.7               14.5 +/-    0.98      21.2 +/-    0.98  0.090 / 0.140