Ah, didnt actully check the extent of the bounding box, But the docs does 
say 

   - Increasing the grid level is not possible, since that would increase 
   the data generated by 400 times. But it is possible to reduce the grid 
   level from the automatically determined value by specifying it in the 
   request:

So depending on extent, specifying levlel 4 may not be possible. 

If you have a large area, could perhaps make a number of smaller requests. 
Would have to subdivide the BBOX. 
Of course be careful to avoid making too many requests. 

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