How do I slow down the scroll screen with touch?

i followed the tutorial to scroll screen with touch but it scrolls way too fast so far my code shows;

on any touch start

• set dragging to 1
• set dragMouseX to touch.AbsoluteX
• set dragMouseY to touch.AbsoluteY

on any touch end

• set dragging to 0
• set dragScrollX to scrollx
• set dragScrollY to scrolly

dragging = 1

• scroll to ((dragScrollX + dragMouseX - touch.AbsoluteX), (dragScrollY + dragMouseY - touch.AbsoluteY))

does anyone know how i can slow down the drag because at the moment it is way too sensitive and flies around the screen.

Thank you