PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-22:28:00
G10     255.1          30.4               10.1 +/-    2.30      17.6 +/-    2.30  0.040 / 0.050
G13     49.2           26.7                7.9 +/-    1.99      14.8 +/-    1.99  0.040 / 0.040
G15     81.9           58.4                9.5 +/-    0.75      10.9 +/-    0.75  0.190 / 0.530
G16     288.9          15.5                7.0 +/-    2.69      17.2 +/-    2.69  0.130 / 0.520
G20     257.7          21.6                5.3 +/-    3.27      11.1 +/-    3.27  0.100 / 0.130
G21     338.7          63.0                8.9 +/-    0.69       9.9 +/-    0.69  0.110 / 0.140
G26     261.5          13.5                8.6 +/-    1.20      22.2 +/-    1.20  0.030 / 0.030
G29     166.5          45.5                9.6 +/-    0.62      12.8 +/-    0.62  0.040 / 0.040