Please answer a question about the following article about Ashkenazi Jews:

Genetic studies on Ashkenazim have been conducted to determine how much of their ancestry comes from the Levant, and how much derives from European populations. These studiesresearching both their paternal and maternal lineagespoint to a significant prevalence of ancient Levantine origins. But they have arrived at diverging conclusions regarding both the degree and the sources of their European ancestry. These diverging conclusions focus particularly on the extent of the European genetic origin observed in Ashkenazi maternal lineages.

Genetic studies on the Ashkenazim have tried to determine how much of their ancestry is derived from European populations and from where?
the Levant