PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-21:13:30
G01     48.0           23.9               11.6 +/-    1.41      23.3 +/-    1.41  0.030 / 0.060
G06     178.9          24.6               17.1 +/-    2.16      33.8 +/-    2.16  0.040 / 0.060
G11     43.8           12.6               10.5 +/-    2.41      27.8 +/-    2.41  0.130 / 0.470
G13     247.4          29.8               15.3 +/-    1.48      26.9 +/-    1.48  0.150 / 0.420
G15     280.8          15.5               11.7 +/-    2.21      28.9 +/-    2.21  0.060 / 0.080
G17     328.2          78.1               14.9 +/-    0.67      15.2 +/-    0.67  0.070 / 0.090
G19     249.5          61.8               15.6 +/-    1.02      17.4 +/-    1.02  0.060 / 0.120
G24     318.6          10.6              -13.0 +/-   31.26     -35.8 +/-   31.26  0.060 / 0.120
G28     49.5           54.9               12.9 +/-    0.53      15.4 +/-    0.53  0.140 / 0.290
G30     150.2          37.8               15.9 +/-    0.75      24.0 +/-    0.75  0.150 / 0.190