PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-23:27:40
G02     201.9          32.7               13.7 +/-    1.26      22.7 +/-    1.26  0.050 / 0.030
G06     163.1          66.1               11.8 +/-    0.19      12.8 +/-    0.19  0.040 / 0.040
G12     305.9          12.8                9.4 +/-    1.66      24.5 +/-    1.66  0.140 / 0.210
G17     28.0           55.1                9.7 +/-    1.36      11.5 +/-    1.36  0.120 / 0.280
G19     351.9          67.2                9.6 +/-    0.38      10.3 +/-    0.38  0.130 / 0.110
G24     301.2          36.4               11.2 +/-    2.43      17.4 +/-    2.43  0.090 / 0.090
G28     99.8           32.8                9.7 +/-    0.78      16.1 +/-    0.78  0.050 / 0.110