PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-20:42:50
G01     59.2           30.1               12.2 +/-    0.90      21.4 +/-    0.90  0.060 / 0.190
G07     141.6          16.2               13.7 +/-    2.14      33.0 +/-    2.14  0.180 / 0.210
G11     47.3           22.7               10.6 +/-    2.76      21.8 +/-    2.76  0.040 / 0.050
G13     261.1          35.8               15.5 +/-    1.34      24.2 +/-    1.34  0.050 / 0.050
G15     292.6          16.6               11.4 +/-    2.20      27.3 +/-    2.20  0.050 / 0.050
G17     261.3          77.5               14.4 +/-    0.49      14.7 +/-    0.49  0.040 / 0.050
G18     40.6           11.1                9.3 +/-    2.60      25.5 +/-    2.60  0.260 / 0.360
G19     232.3          51.3               15.3 +/-    2.33      18.9 +/-    2.33  0.180 / 0.380
G28     28.8           58.7               10.9 +/-    0.88      12.5 +/-    0.88  0.060 / 0.110
G30     143.7          50.2               13.9 +/-    0.36      17.5 +/-    0.36  0.080 / 0.140