PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-21:12:40
G01     40.2           15.3                9.9 +/-    2.00      24.5 +/-    2.00  0.130 / 0.290
G06     176.3          37.8               15.8 +/-    1.06      23.9 +/-    1.06  0.140 / 0.250
G13     236.0          21.9               15.1 +/-    1.71      31.7 +/-    1.71  0.070 / 0.090
G15     269.2          12.0               13.4 +/-    2.18      35.7 +/-    2.18  0.070 / 0.090
G17     4.8            69.6               12.5 +/-    0.75      13.2 +/-    0.75  0.040 / 0.070
G19     279.8          69.8               12.3 +/-    0.47      13.0 +/-    0.47  0.040 / 0.060
G24     315.7          20.7               10.6 +/-    1.15      23.0 +/-    1.15  0.120 / 0.330
G28     68.1           49.8               11.0 +/-    0.74      13.9 +/-    0.74  0.100 / 0.280
G30     154.3          25.0               15.5 +/-    0.73      30.3 +/-    0.73  0.080 / 0.230