Attenuation curve of the twisted pair cable
Your UTP curve is only qualitative, i.e. doesn't show actual numbers. Your STP cable will show similar behavior: attenuation increases with distance, and so does crosstalk. The shielding won't prevent that. The qualitative image will look the same.  

Quantitatively, expect the STP to have a higher attenuation due to capacitive coupling with the shielding's ground.