PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-13:42:40
G01     120.4          16.7                8.8 +/-    1.55      20.9 +/-    1.55  0.040 / 0.040
G07     81.2           64.5                8.7 +/-    0.42       9.5 +/-    0.42  0.040 / 0.050
G08     45.3           31.2                7.1 +/-    0.66      12.0 +/-    0.66  0.120 / 0.190
G09     175.8          26.3                8.8 +/-    1.25      16.6 +/-    1.25  0.110 / 0.230
G11     105.9          37.7                9.0 +/-    1.83      13.6 +/-    1.83  0.040 / 0.040
G13     319.4          16.2                4.0 +/-    1.81       9.7 +/-    1.81  0.030 / 0.030
G17     200.5          25.0                8.4 +/-    1.33      16.4 +/-    1.33  0.120 / 0.160
G28     289.7          56.5                8.1 +/-    1.02       9.5 +/-    1.02  0.060 / 0.170
G30     339.8          65.0                7.9 +/-    0.83       8.6 +/-    0.83  0.110 / 0.380