Hello,madam，I am a student from China.I read your paper named" The largest Quaternary inland eolian system in Brazil: Eolian landforms and activation/stabilization phases of the Xique-Xique dune field."Here are some questions I do not kown.So I want to learn from you.The prevailing wind direction of the dune field is the southeast wind. However, the altitude of the eastern mountain in the study area can reach 1500 meters, which has a blocking effect on the prevailing wind. Will it change the prevailing wind？Why do your sample deep layers and not shallow ones？Now there is a saying that optically stimulated luminescence age reflects the age of sediment rest, and you regard age as a sign of activity here, how do you distinguish activity and rest by age.These are my questions.Thank you.