PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-21:28:00
G01     62.5           31.4               12.7 +/-    0.96      21.6 +/-    0.96  0.080 / 0.300
G07     141.3          24.8               15.1 +/-    0.73      29.7 +/-    0.73  0.130 / 0.320
G11     50.1           26.7               11.1 +/-    1.71      20.9 +/-    1.71  0.050 / 0.090
G13     265.7          35.9               16.4 +/-    1.36      25.6 +/-    1.36  0.060 / 0.090
G15     295.9          16.3               11.5 +/-    3.60      27.7 +/-    3.60  0.070 / 0.170
G17     245.6          70.4               16.9 +/-    0.60      17.8 +/-    0.60  0.070 / 0.150
G18     44.1           14.6                9.8 +/-    1.79      24.5 +/-    1.79  0.080 / 0.210
G19     230.4          47.8               18.5 +/-    0.77      23.9 +/-    0.77  0.070 / 0.190
G28     32.7           57.2               13.2 +/-    0.42      15.4 +/-    0.42  0.040 / 0.050
G30     141.8          52.9               15.5 +/-    0.94      18.9 +/-    0.94  0.030 / 0.060