PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-13:57:50
G02     203.4          33.7                9.8 +/-    1.67      15.9 +/-    1.67  0.120 / 0.350
G03     59.1           9.7                 5.6 +/-    2.92      15.7 +/-    2.92  0.150 / 0.270
G06     162.7          68.3                8.7 +/-    0.66       9.3 +/-    0.66  0.180 / 0.330
G12     307.7          14.9                6.1 +/-    1.86      15.3 +/-    1.86  0.110 / 0.180
G17     38.5           47.1                6.7 +/-    1.52       8.8 +/-    1.52  0.080 / 0.060
G19     6.3            64.3                7.3 +/-    0.55       8.0 +/-    0.55  0.090 / 0.060
G24     299.7          37.0                7.5 +/-    2.44      11.5 +/-    2.44  0.030 / 0.040
G28     103.0          30.7                7.4 +/-    0.77      12.9 +/-    0.77  0.050 / 0.040