PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-22:28:00
G01     42.7           18.6                9.3 +/-    1.18      21.2 +/-    1.18  0.090 / 0.200
G06     175.4          36.3               15.7 +/-    1.23      24.4 +/-    1.23  0.090 / 0.170
G13     240.5          23.9               12.5 +/-    2.56      24.9 +/-    2.56  0.080 / 0.150
G15     273.5          13.2               12.3 +/-    0.82      31.9 +/-    0.82  0.080 / 0.150
G17     338.6          74.4               11.3 +/-    0.49      11.7 +/-    0.49  0.040 / 0.060
G19     268.0          66.8               10.2 +/-    0.67      11.0 +/-    0.67  0.040 / 0.070
G24     317.4          16.8               10.3 +/-    2.25      24.5 +/-    2.25  0.160 / 0.260
G28     68.2           48.0               10.1 +/-    0.37      13.1 +/-    0.37  0.140 / 0.260
G30     153.3          28.9               15.4 +/-    1.05      27.6 +/-    1.05  0.060 / 0.100