PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-21:27:50
G01     62.5           31.4               12.5 +/-    1.64      21.4 +/-    1.64  0.210 / 0.300
G07     141.3          24.8               15.6 +/-    1.92      30.7 +/-    1.92  0.110 / 0.350
G11     50.1           26.7                9.8 +/-    2.06      18.4 +/-    2.06  0.190 / 0.270
G13     265.7          35.9               17.0 +/-    1.88      26.6 +/-    1.88  0.140 / 0.260
G15     295.9          16.3               12.6 +/-    1.22      30.5 +/-    1.22  0.110 / 0.100
G17     245.6          70.4               16.4 +/-    0.41      17.3 +/-    0.41  0.070 / 0.100
G18     44.1           14.6               10.8 +/-    2.30      27.2 +/-    2.30  0.090 / 0.070
G19     230.4          47.8               16.6 +/-    2.20      21.5 +/-    2.20  0.040 / 0.040
G28     32.7           57.2               15.7 +/-    0.62      18.3 +/-    0.62  0.070 / 0.140
G30     141.8          52.9               16.5 +/-    0.60      20.1 +/-    0.60  0.060 / 0.130