e-mail message Hi Andre, Good to listen to you, I am so exciting in finnaly meet you and can talk about our both projects ongoing. In my opinion, you should not to spend so many time collecting spectral data for all distribution of the lineages, considering that your study area is more restrict at Peru. I agree with you that examining the vouchers personaly is important for a background. However, spectra data for few specimens by lineages should be plenty for comparing with your zone of introgression. Moreover, I also hope that the map that i sent you previously and which is part of my doctoral project should help you to have a overview of of the geographic variation in plumage color of this species even if tt is only to compare with your transect. I have studying color analisys since 2012 and i am sure the error measurement is very low for influencing the color analisis. For you have an idea, database of bird plumage color measured with spectrophotometry of different researchers are available today collected with different protocols. For example, see: http://evoldir.tumblr.com/post/165392386711/other-birdcolourbase By the way, i would be happy to can use your spectra data from Peru area and surely we can talk about colaborations in my paper later. Best regards