PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-10:57:50
G10     255.4          30.1                3.6 +/-    2.20       6.2 +/-    2.20  0.060 / 0.060
G13     49.4           27.3                2.5 +/-    1.57       4.7 +/-    1.57  0.060 / 0.070
G15     73.6           54.6                4.9 +/-    0.63       5.9 +/-    0.63  0.060 / 0.040
G16     291.5          14.4                4.1 +/-    1.31      10.3 +/-    1.31  0.050 / 0.040
G20     42.3           49.5                2.6 +/-    0.36       3.4 +/-    0.36  0.130 / 0.240
G21     345.0          65.5                0.4 +/-    0.88       0.5 +/-    0.88  0.150 / 0.400
G26     262.7          13.2                5.3 +/-    1.36      13.6 +/-    1.36  0.080 / 0.250
G27     322.1          10.4              -14.7 +/-   16.95     -40.5 +/-   16.95  0.080 / 0.260
G29     165.5          42.2                6.6 +/-    1.42       9.2 +/-    1.42  0.070 / 0.170