PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-14:27:50
G02     229.3          67.1                7.2 +/-    0.92       7.8 +/-    0.92  0.140 / 0.100
G06     42.6           62.5                6.0 +/-    0.56       6.7 +/-    0.56  0.080 / 0.080
G12     322.0          49.9                5.9 +/-    0.78       7.5 +/-    0.78  0.040 / 0.040
G17     67.5           23.9                6.5 +/-    1.50      12.9 +/-    1.50  0.040 / 0.040
G19     47.6           45.5                6.1 +/-    0.89       8.2 +/-    0.89  0.040 / 0.020
G24     247.6          37.4                7.9 +/-    0.95      12.1 +/-    0.95  0.030 / 0.040