PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-09:27:40
G02     267.2          81.2                3.9 +/-    0.49       3.9 +/-    0.49  0.100 / 0.150
G05     170.0          20.6                4.4 +/-    2.14       9.5 +/-    2.14  0.100 / 0.170
G06     38.6           59.2                4.0 +/-    0.34       4.6 +/-    0.34  0.040 / 0.040
G12     320.8          55.5                3.6 +/-    0.67       4.3 +/-    0.67  0.040 / 0.030
G17     75.8           18.7                2.8 +/-    0.94       6.3 +/-    0.94  0.090 / 0.160
G19     63.3           34.5                4.3 +/-    0.97       6.8 +/-    0.97  0.120 / 0.110
G24     241.5          32.0                3.6 +/-    1.09       6.1 +/-    1.09  0.260 / 0.310
G25     317.5          16.8                2.4 +/-    2.30       5.7 +/-    2.30  0.170 / 0.310