PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/15-22:57:40
G02     218.8          64.0               16.8 +/-    0.53      18.5 +/-    0.53  0.040 / 0.060
G06     50.9           70.9               14.6 +/-    0.67      15.3 +/-    0.67  0.030 / 0.070
G12     319.7          39.5               12.7 +/-    0.76      18.7 +/-    0.76  0.040 / 0.040
G17     58.2           33.1               11.8 +/-    0.58      19.3 +/-    0.58  0.050 / 0.060
G19     41.5           48.3               13.4 +/-    0.49      17.3 +/-    0.49  0.100 / 0.320
G24     260.9          40.8               16.0 +/-    1.56      22.9 +/-    1.56  0.150 / 0.390
G28     124.8          11.1               14.9 +/-    3.13      40.7 +/-    3.13  0.060 / 0.080