PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/15-19:57:50
G01     123.0          15.0               14.6 +/-    3.61      36.4 +/-    3.61  0.090 / 0.030
G07     66.7           68.7               12.4 +/-    0.31      13.2 +/-    0.31  0.050 / 0.030
G08     48.9           39.3                9.8 +/-    1.20      14.4 +/-    1.20  0.140 / 0.100
G09     178.1          31.4               13.9 +/-    1.39      23.7 +/-    1.39  0.160 / 0.120
G11     114.8          37.7               15.9 +/-    1.41      24.0 +/-    1.41  0.040 / 0.020
G13     319.8          15.4               10.6 +/-    2.46      26.1 +/-    2.46  0.040 / 0.010
G17     202.2          15.8               21.6 +/-    2.54      52.8 +/-    2.54  0.100 / 0.250
G18     99.5           18.9               12.6 +/-    1.24      28.6 +/-    1.24  0.090 / 0.250
G28     285.2          55.7               13.0 +/-    2.52      15.4 +/-    2.52  0.030 / 0.020
G30     343.1          66.2               11.7 +/-    0.59      12.7 +/-    0.59  0.030 / 0.010