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               14.5 +/-    0.98      23.9 +/-    0.98  0.120 / 0.430
G07     138.0          30.6               17.1 +/-    1.37      29.6 +/-    1.37  0.120 / 0.390
G11     53.9           31.2               12.5 +/-    0.66      21.3 +/-    0.66  0.070 / 0.140
G13     273.6          37.3               16.2 +/-    1.16      24.7 +/-    1.16  0.050 / 0.150
G15     301.8          15.5                9.9 +/-    2.07      24.4 +/-    2.07  0.030 / 0.050
G17     233.4          65.4               18.9 +/-    0.67      20.6 +/-    0.67  0.040 / 0.040
G18     48.7           18.1               10.4 +/-    1.25      24.1 +/-    1.25  0.040 / 0.080
G19     224.9          41.9               18.8 +/-    1.29      26.5 +/-    1.29  0.050 / 0.090
G28     21.9           58.9               14.0 +/-    0.22      16.0 +/-    0.22  0.060 / 0.130
G30     136.4          59.3               17.4 +/-    0.66      19.9 +/-    0.66  0.060 / 0.130