PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-15:12:50
G01     76.7           33.0               10.0 +/-    1.37      16.5 +/-    1.37  0.110 / 0.220
G07     134.1          32.3               11.7 +/-    1.33      19.6 +/-    1.33  0.150 / 0.270
G11     56.4           31.3                9.5 +/-    1.25      16.2 +/-    1.25  0.080 / 0.100
G13     283.4          36.9               11.5 +/-    2.42      17.6 +/-    2.42  0.070 / 0.120
G15     309.9          12.4                7.9 +/-    2.07      20.9 +/-    2.07  0.030 / 0.020
G17     225.9          67.1               12.9 +/-    0.86      13.9 +/-    0.86  0.030 / 0.020
G19     220.6          39.2               12.6 +/-    1.37      18.5 +/-    1.37  0.070 / 0.100
G28     10.3           60.2               11.2 +/-    0.79      12.7 +/-    0.79  0.070 / 0.090
G30     126.9          69.3               11.6 +/-    0.46      12.3 +/-    0.46  0.030 / 0.040