PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-19:27:40
G01     317.2          21.7                8.5 +/-    2.82      17.9 +/-    2.82  0.190 / 0.340
G08     253.6          10.7                7.8 +/-   13.80      21.5 +/-   13.80  0.120 / 0.230
G10     86.4           51.1                8.6 +/-    0.91      10.8 +/-    0.91  0.290 / 0.380
G11     299.4          24.7                6.6 +/-    2.10      12.9 +/-    2.10  0.300 / 0.320
G14     312.6          71.1                7.5 +/-    0.54       7.8 +/-    0.54  0.040 / 0.060
G18     106.4          24.2                9.6 +/-    1.64      19.0 +/-    1.64  0.060 / 0.050
G22     302.8          13.4                8.1 +/-    3.29      20.8 +/-    3.29  0.040 / 0.030
G25     96.9           10.6                8.6 +/-   19.99      23.7 +/-   19.99  0.050 / 0.030
G31     176.5          46.0               11.3 +/-    0.65      15.1 +/-    0.65  0.080 / 0.040
G32     14.3           64.5                7.5 +/-    0.52       8.2 +/-    0.52  0.080 / 0.040