PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/11/20-20:12:40
G01     319.8          16.1               10.3 +/-    1.61      24.9 +/-    1.61  0.040 / 0.040
G08     257.4          14.4                9.3 +/-    2.67      23.4 +/-    2.67  0.040 / 0.040
G10     76.5           53.9                9.6 +/-    0.85      11.6 +/-    0.85  0.190 / 0.270
G11     304.1          22.8                9.4 +/-    1.02      19.3 +/-    1.02  0.160 / 0.290
G14     290.4          70.4                8.8 +/-    0.52       9.2 +/-    0.52  0.140 / 0.260
G20     103.4          30.6                9.5 +/-    0.65      16.4 +/-    0.65  0.160 / 0.250
G31     178.4          37.5                9.8 +/-    1.06      14.8 +/-    1.06  0.050 / 0.030
G32     2.2            69.2                8.6 +/-    0.44       9.1 +/-    0.44  0.040 / 0.030