PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-14:58:10
G01     84.5           32.5               10.8 +/-    1.12      18.0 +/-    1.12  0.040 / 0.070
G07     129.5          38.1               11.5 +/-    1.00      17.3 +/-    1.00  0.030 / 0.070
G11     62.1           35.0                8.8 +/-    0.68      13.9 +/-    0.68  0.070 / 0.100
G13     291.4          36.0               10.0 +/-    1.38      15.7 +/-    1.38  0.070 / 0.100
G17     218.1          60.7               13.4 +/-    0.67      15.1 +/-    0.67  0.030 / 0.040
G19     216.7          33.1               10.9 +/-    1.04      17.9 +/-    1.04  0.030 / 0.030
G28     357.9          61.2               10.4 +/-    0.66      11.7 +/-    0.66  0.030 / 0.050
G30     112.2          74.9               12.2 +/-    0.63      12.6 +/-    0.63  0.030 / 0.050