PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-19:12:30
G02     217.3          56.8               17.9 +/-    1.00      21.0 +/-    1.00  0.060 / 0.080
G06     55.0           72.9               16.1 +/-    0.39      16.8 +/-    0.39  0.060 / 0.090
G12     319.6          38.8               12.7 +/-    1.08      18.9 +/-    1.08  0.040 / 0.060
G17     60.3           29.3               13.1 +/-    1.19      23.3 +/-    1.19  0.040 / 0.060
G19     43.5           46.6               13.4 +/-    0.74      17.7 +/-    0.74  0.050 / 0.090
G24     266.2          41.3               16.5 +/-    1.55      23.5 +/-    1.55  0.070 / 0.100
G28     123.9          12.4               15.2 +/-    2.34      40.1 +/-    2.34  0.060 / 0.070