PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/17-13:12:30
G02     213.9          54.6                6.6 +/-    1.23       7.9 +/-    1.23  0.070 / 0.060
G06     67.2           76.1                5.6 +/-    0.47       5.7 +/-    0.47  0.080 / 0.070
G12     317.0          33.5                2.6 +/-    1.12       4.2 +/-    1.12  0.040 / 0.060
G17     52.6           36.2                4.8 +/-    1.17       7.4 +/-    1.17  0.050 / 0.080
G19     36.8           50.0                4.4 +/-    1.54       5.6 +/-    1.54  0.050 / 0.050
G24     271.7          41.5                7.9 +/-    2.70      11.3 +/-    2.70  0.060 / 0.050
G28     117.8          22.7                6.5 +/-    0.95      13.4 +/-    0.95  0.030 / 0.030