PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-20:58:00
G01     83.5           33.0               14.8 +/-    1.72      24.4 +/-    1.72  0.120 / 0.160
G07     130.3          41.0               16.1 +/-    0.89      23.1 +/-    0.89  0.130 / 0.190
G11     64.0           38.3               13.8 +/-    0.92      20.7 +/-    0.92  0.110 / 0.210
G13     288.2          37.1               15.6 +/-    1.27      23.9 +/-    1.27  0.120 / 0.220
G15     311.2          12.3               12.5 +/-    2.02      33.1 +/-    2.02  0.090 / 0.100
G17     219.8          54.3               16.7 +/-    1.24      20.0 +/-    1.24  0.050 / 0.110
G18     58.7           22.7               12.6 +/-    1.16      25.9 +/-    1.16  0.040 / 0.030
G19     217.5          31.4               16.8 +/-    1.72      28.6 +/-    1.72  0.030 / 0.030
G28     0.9            61.1               13.1 +/-    0.64      14.7 +/-    0.64  0.040 / 0.060
G30     120.6          69.8               15.9 +/-    0.92      16.8 +/-    0.92  0.030 / 0.070