content_image/313482.jpg
<img src='content_image/313482.jpg'>

As it can be seen from this plot, the RG improvement changes slightly the power spectrum for large wave numbers. In order to see how much such an improvement is, the observational data and the obtained results are compared in figure (4). 

The observational data are from [19], the solid curve is the non–improved power spectrum with the spectral index n$_{s}$ = 0 . 967 ( κ $^{n$_{s}$}$T ( κ )). The dashed curve is the prediction of the improved model considered in this paper with the slow roll parameter ϵ = 0 . 008. In both curves we choose Ω$_{M}$ h = 0 . 16. 

As it is seen from the results, the effect of improvement is to bring the tail of the graph up and leads to more accurate fit with the observed results. 

