PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-05:27:40
G02     252.4          79.7                4.5 +/-    0.72       4.5 +/-    0.72  0.030 / 0.040
G05     170.1          18.7                4.9 +/-    1.11      11.1 +/-    1.11  0.030 / 0.030
G06     39.8           58.8                4.1 +/-    0.68       4.7 +/-    0.68  0.080 / 0.200
G12     321.2          52.6                4.2 +/-    1.58       5.1 +/-    1.58  0.070 / 0.200
G17     72.2           22.4                2.5 +/-    0.97       5.3 +/-    0.97  0.070 / 0.130
G19     59.6           37.1                3.0 +/-    0.84       4.5 +/-    0.84  0.060 / 0.160
G24     244.0          33.7                6.4 +/-    0.99      10.3 +/-    0.99  0.030 / 0.040
G25     317.1          13.4                3.1 +/-    2.64       7.9 +/-    2.64  0.030 / 0.050