PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-23:42:50
G02     212.3          56.8               12.3 +/-    1.06      14.4 +/-    1.06  0.070 / 0.080
G06     71.7           77.4               10.0 +/-    0.42      10.2 +/-    0.42  0.090 / 0.110
G12     317.1          32.2                8.7 +/-    1.32      14.6 +/-    1.32  0.030 / 0.020
G17     51.2           38.5               10.2 +/-    1.40      15.2 +/-    1.40  0.040 / 0.020
G19     32.7           52.9               10.3 +/-    1.23      12.5 +/-    1.23  0.060 / 0.070
G24     271.4          42.3               10.7 +/-    4.11      15.1 +/-    4.11  0.060 / 0.060
G28     119.8          16.6               12.8 +/-    1.69      30.7 +/-    1.69  0.090 / 0.210