PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-09:13:00
G01     223.5          14.5               -4.6 +/-   30.02     -11.7 +/-   30.02  0.190 / 0.280
G03     282.3          67.4                9.6 +/-    5.09      10.3 +/-    5.09  0.210 / 0.240
G09     296.7          11.4               -4.1 +/-   26.50     -11.0 +/-   26.50  0.040 / 0.040
G14     90.6           20.4                2.9 +/-    2.32       6.4 +/-    2.32  0.030 / 0.030
G16     144.7          48.5                9.7 +/-    2.31      12.4 +/-    2.31  0.220 / 0.520
G22     205.2          67.4               33.8 +/-   31.58      36.3 +/-   31.58  0.360 / 0.240
G23     309.2          38.7                9.9 +/-    9.31      14.8 +/-    9.31  0.040 / 0.090
G26     92.7           55.0              -49.6 +/-   78.30     -59.1 +/-   78.30  0.040 / 0.070
G31     46.4           29.2               10.9 +/-   14.49      19.4 +/-   14.49  0.040 / 0.040