PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/15-17:58:00
G01     122.1          15.8               15.0 +/-    1.41      36.5 +/-    1.41  0.040 / 0.080
G07     70.4           68.3               13.8 +/-    0.92      14.7 +/-    0.92  0.040 / 0.070
G08     47.5           36.7               11.5 +/-    0.94      17.7 +/-    0.94  0.030 / 0.040
G09     177.6          29.6               13.7 +/-    1.98      24.2 +/-    1.98  0.030 / 0.040
G11     112.4          38.4               15.4 +/-    0.86      22.9 +/-    0.86  0.040 / 0.110
G13     319.2          16.6               11.5 +/-    2.29      27.4 +/-    2.29  0.040 / 0.100
G17     202.0          18.2               15.5 +/-    0.81      35.7 +/-    0.81  0.040 / 0.060
G18     98.2           19.5               13.1 +/-    1.48      29.3 +/-    1.48  0.040 / 0.050
G28     287.0          56.1               14.3 +/-    0.61      16.9 +/-    0.61  0.030 / 0.030
G30     343.0          66.5               12.6 +/-    0.52      13.7 +/-    0.52  0.040 / 0.040