PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-14:13:00
G01     64.9           31.7                8.8 +/-    0.82      14.8 +/-    0.82  0.050 / 0.140
G06     181.4          10.9               -3.4 +/-   41.21      -9.3 +/-   41.21  0.110 / 0.140
G07     139.8          23.7                9.6 +/-    1.33      19.4 +/-    1.33  0.060 / 0.140
G11     49.8           24.7                6.5 +/-    1.56      12.7 +/-    1.56  0.060 / 0.140
G13     270.7          36.1                8.6 +/-    0.69      13.4 +/-    0.69  0.030 / 0.050
G15     300.5          15.2                3.6 +/-    1.16       8.9 +/-    1.16  0.030 / 0.040
G17     248.4          75.9                9.1 +/-    0.65       9.3 +/-    0.65  0.040 / 0.080
G19     228.6          48.7                9.9 +/-    1.38      12.7 +/-    1.38  0.040 / 0.100
G28     28.5           57.8                6.8 +/-    0.39       7.8 +/-    0.39  0.020 / 0.040
G30     139.6          59.1                8.7 +/-    0.59      10.0 +/-    0.59  0.020 / 0.030