PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/31-18:28:00
G03     186.1          13.0               15.6 +/-    2.53      40.7 +/-    2.53  0.060 / 0.110
G07     296.6          40.7               10.5 +/-    1.26      15.1 +/-    1.26  0.060 / 0.080
G08     141.3          32.0               13.4 +/-    0.69      22.5 +/-    0.69  0.040 / 0.050
G09     317.7          68.7               10.0 +/-    0.98      10.7 +/-    0.98  0.030 / 0.050
G16     41.7           31.9                9.4 +/-    0.72      15.9 +/-    0.72  0.070 / 0.140
G23     132.9          69.5               11.0 +/-    1.20      11.7 +/-    1.20  0.070 / 0.120
G27     90.4           35.9               11.8 +/-    0.56      18.4 +/-    0.56  0.090 / 0.310
G30     279.7          18.5               10.7 +/-    1.64      24.5 +/-    1.64  0.100 / 0.370