PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/13-06:27:50
G01     62.5           31.2                4.8 +/-    0.60       8.3 +/-    0.60  0.030 / 0.050
G07     141.2          23.8                7.3 +/-    0.95      14.7 +/-    0.95  0.040 / 0.060
G11     49.7           25.6                4.9 +/-    1.51       9.4 +/-    1.51  0.080 / 0.130
G13     266.9          35.6                8.0 +/-    1.36      12.5 +/-    1.36  0.040 / 0.160
G15     295.5          16.7                3.1 +/-    1.53       7.5 +/-    1.53  0.030 / 0.030
G17     253.7          75.9                7.0 +/-    0.58       7.2 +/-    0.58  0.030 / 0.030
G19     230.9          50.1                8.5 +/-    0.84      10.7 +/-    0.84  0.070 / 0.190
G28     33.3           57.0                4.8 +/-    0.37       5.6 +/-    0.37  0.070 / 0.160
G30     141.5          52.9                9.0 +/-    1.30      11.0 +/-    1.30  0.050 / 0.100