Apparently, it's Hotspots in the grid: Avian sensitivity and vulnerability to collision risk from energy infrastructure interactions in Europe and North Africa

Apparently, it's Hotspots in the grid: Avian sensitivity and vulnerability to collision risk from energy infrastructure interactions in Europe and North Africa (https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2664.14160 https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365...). It's fortunately open-access and it indeed has some low-resolution maps but I haven't seen a higher-resolution version (it's not vector even in the PDF version).