PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-10:12:30
G02     307.5          82.2                5.9 +/-    0.68       6.0 +/-    0.68  0.110 / 0.110
G05     168.1          25.5                8.9 +/-    2.22      17.1 +/-    2.22  0.110 / 0.110
G06     38.6           53.6                5.4 +/-    0.67       6.5 +/-    0.67  0.030 / 0.030
G12     319.1          61.2                5.1 +/-    0.82       5.7 +/-    0.82  0.030 / 0.030
G17     80.4           15.2                4.5 +/-    1.33      11.2 +/-    1.33  0.040 / 0.040
G19     68.6           31.0                5.3 +/-    1.64       9.1 +/-    1.64  0.030 / 0.030
G24     236.3          28.5                8.4 +/-    0.83      15.3 +/-    0.83  0.290 / 0.200
G25     317.9          21.9                5.3 +/-    2.12      11.1 +/-    2.12  0.240 / 0.140