PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/13-21:57:50
G02     202.2          32.2               16.9 +/-    1.44      28.4 +/-    1.44  0.180 / 0.250
G06     161.9          66.5               13.4 +/-    0.34      14.5 +/-    0.34  0.110 / 0.200
G12     306.1          13.5                9.9 +/-    3.76      25.6 +/-    3.76  0.090 / 0.100
G17     29.5           54.2               12.0 +/-    1.10      14.5 +/-    1.10  0.070 / 0.070
G19     350.5          67.4               11.8 +/-    0.46      12.7 +/-    0.46  0.030 / 0.030
G24     301.0          36.7               11.7 +/-    2.88      18.1 +/-    2.88  0.030 / 0.040
G28     99.7           32.9               12.0 +/-    1.25      19.7 +/-    1.25  0.060 / 0.120