PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/07-20:27:50
G01     63.9           31.7                9.2 +/-    1.30      15.5 +/-    1.30  0.100 / 0.220
G07     140.7          25.9               13.6 +/-    0.88      26.1 +/-    0.88  0.120 / 0.230
G11     50.6           27.4                8.0 +/-    2.20      14.9 +/-    2.20  0.070 / 0.110
G13     267.1          36.3               13.7 +/-    1.76      21.2 +/-    1.76  0.060 / 0.100
G15     297.4          16.1               10.4 +/-    1.25      25.3 +/-    1.25  0.030 / 0.030
G17     243.4          70.3               13.3 +/-    0.47      14.0 +/-    0.47  0.030 / 0.030
G18     44.9           15.3                8.5 +/-    2.08      21.1 +/-    2.08  0.090 / 0.300
G19     229.2          46.3               14.1 +/-    2.41      18.7 +/-    2.41  0.090 / 0.270
G28     30.5           57.6               13.4 +/-    0.98      15.6 +/-    0.98  0.050 / 0.040
G30     140.9          54.6               13.6 +/-    0.49      16.2 +/-    0.49  0.030 / 0.050