PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-22:57:40
G01     227.0          17.6               10.4 +/-    1.79      24.3 +/-    1.79  0.030 / 0.030
G03     289.1          67.0                8.4 +/-    0.39       9.0 +/-    0.39  0.030 / 0.030
G14     86.1           24.5                8.9 +/-    1.41      17.6 +/-    1.41  0.040 / 0.060
G16     152.2          42.4               11.7 +/-    0.80      16.3 +/-    0.80  0.040 / 0.080
G22     220.7          71.7                8.6 +/-    0.30       9.0 +/-    0.30  0.110 / 0.170
G23     306.3          36.0                9.2 +/-    1.39      14.3 +/-    1.39  0.110 / 0.170
G26     102.5          54.6               10.0 +/-    0.29      12.0 +/-    0.29  0.070 / 0.090
G31     44.2           34.8                7.8 +/-    1.03      12.4 +/-    1.03  0.080 / 0.090