PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-00:13:10
G10     245.6          22.4               14.3 +/-    1.89      29.7 +/-    1.89  0.120 / 0.550
G13     59.5           32.8               10.9 +/-    0.36      18.0 +/-    0.36  0.120 / 0.510
G15     103.6          58.4               14.4 +/-    0.38      16.6 +/-    0.38  0.040 / 0.070
G16     300.3          15.9                7.9 +/-    2.99      19.2 +/-    2.99  0.040 / 0.060
G20     254.4          30.7               11.2 +/-    0.67      19.3 +/-    0.67  0.090 / 0.200
G21     325.6          55.3               11.8 +/-    0.71      14.0 +/-    0.71  0.090 / 0.230
G26     272.1          17.9               10.4 +/-    1.13      24.0 +/-    1.13  0.030 / 0.050
G29     163.4          58.0               13.3 +/-    0.96      15.3 +/-    0.96  0.030 / 0.050