PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-18:42:40
G01     85.8           32.7               11.6 +/-    1.45      19.3 +/-    1.45  0.230 / 0.190
G07     128.8          42.7               15.1 +/-    0.62      21.0 +/-    0.62  0.170 / 0.230
G11     65.3           38.7               12.5 +/-    1.86      18.6 +/-    1.86  0.030 / 0.050
G13     290.3          36.9               14.5 +/-    2.82      22.3 +/-    2.82  0.030 / 0.050
G15     313.2          11.1                5.6 +/-   21.91      15.2 +/-   21.91  0.030 / 0.020
G17     218.0          54.3               16.1 +/-    0.81      19.3 +/-    0.81  0.030 / 0.020
G18     60.4           23.2               10.6 +/-    1.11      21.6 +/-    1.11  0.050 / 0.110
G19     216.6          29.0               17.0 +/-    1.76      30.3 +/-    1.76  0.070 / 0.100
G28     356.8          61.4               12.1 +/-    0.92      13.6 +/-    0.92  0.100 / 0.190
G30     115.7          72.6               15.0 +/-    0.70      15.6 +/-    0.70  0.100 / 0.170