PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-20:58:00
G01     69.7           32.8               13.4 +/-    0.95      22.1 +/-    0.95  0.030 / 0.030
G07     138.0          30.6               16.6 +/-    1.43      28.7 +/-    1.43  0.040 / 0.040
G11     53.9           31.2               12.7 +/-    1.19      21.6 +/-    1.19  0.080 / 0.270
G13     273.6          37.3               14.4 +/-    2.95      21.9 +/-    2.95  0.110 / 0.250
G15     301.8          15.5                9.3 +/-    1.46      22.8 +/-    1.46  0.030 / 0.050
G17     233.4          65.4               18.0 +/-    0.85      19.6 +/-    0.85  0.030 / 0.050
G18     48.7           18.1               12.0 +/-    3.28      27.7 +/-    3.28  0.110 / 0.200
G19     224.9          41.9               18.4 +/-    1.80      26.0 +/-    1.80  0.100 / 0.200
G28     21.9           58.9               12.7 +/-    1.40      14.5 +/-    1.40  0.060 / 0.080
G30     136.4          59.3               16.6 +/-    0.45      18.9 +/-    0.45  0.060 / 0.080