PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/15-18:12:50
G01     116.3          20.0               15.1 +/-    1.38      33.2 +/-    1.38  0.100 / 0.060
G07     87.8           65.2               14.5 +/-    0.48      15.8 +/-    0.48  0.070 / 0.090
G08     44.4           31.0               11.8 +/-    1.17      20.2 +/-    1.17  0.030 / 0.030
G09     176.6          22.9               13.1 +/-    1.34      27.0 +/-    1.34  0.030 / 0.030
G11     103.8          41.2               13.9 +/-    0.98      19.8 +/-    0.98  0.040 / 0.040
G13     316.1          21.8               12.5 +/-    1.20      26.5 +/-    1.20  0.030 / 0.030
G17     203.5          24.9               15.1 +/-    1.33      29.6 +/-    1.33  0.120 / 0.210
G18     91.3           22.0               13.1 +/-    1.52      27.4 +/-    1.52  0.120 / 0.180
G28     299.3          58.7               13.9 +/-    1.05      16.0 +/-    1.05  0.040 / 0.050
G30     355.6          71.9               15.1 +/-    0.23      15.8 +/-    0.23  0.040 / 0.060