PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-19:27:50
G01     115.7          20.4               18.1 +/-    2.23      39.4 +/-    2.23  0.030 / 0.030
G07     89.1           64.9               15.1 +/-    0.62      16.5 +/-    0.62  0.030 / 0.030
G08     44.5           31.3               12.1 +/-    0.95      20.6 +/-    0.95  0.050 / 0.070
G09     176.8          22.6               17.2 +/-    1.32      35.5 +/-    1.32  0.070 / 0.080
G11     103.6          41.4               17.1 +/-    0.88      24.3 +/-    0.88  0.040 / 0.070
G13     315.9          22.1               11.4 +/-    1.59      23.7 +/-    1.59  0.050 / 0.060
G17     204.0          24.6               19.8 +/-    2.52      39.0 +/-    2.52  0.110 / 0.190
G18     90.8           22.2               13.7 +/-    2.21      28.6 +/-    2.21  0.120 / 0.210
G28     300.6          58.9               14.7 +/-    0.92      16.8 +/-    0.92  0.040 / 0.040
G30     358.9          72.7               14.9 +/-    0.54      15.5 +/-    0.54  0.040 / 0.040