PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-19:27:50
G01     69.7           32.9               13.5 +/-    1.28      22.4 +/-    1.28  0.060 / 0.080
G07     138.0          30.6               16.9 +/-    1.67      29.2 +/-    1.67  0.040 / 0.080
G11     53.5           30.8               13.3 +/-    1.60      23.0 +/-    1.60  0.030 / 0.030
G13     273.4          37.4               14.6 +/-    2.46      22.2 +/-    2.46  0.030 / 0.040
G15     302.2          15.2                9.4 +/-    1.88      23.4 +/-    1.88  0.030 / 0.040
G17     233.9          66.7               16.7 +/-    0.54      18.0 +/-    0.54  0.030 / 0.050
G18     48.5           18.0               12.0 +/-    2.48      27.8 +/-    2.48  0.130 / 0.180
G19     224.9          41.4               17.4 +/-    1.67      24.7 +/-    1.67  0.130 / 0.190
G28     21.7           59.0               13.9 +/-    1.94      15.9 +/-    1.94  0.090 / 0.160
G30     136.5          60.1               17.3 +/-    0.39      19.7 +/-    0.39  0.060 / 0.120