My guess was .50, a quick Google search provided the following...
SPOTTING DEDUCTIONS - LEVELS 2, 3, 4, 5, 6 - BARS - BEAM - FLOOR
[FONT=Arial,Arial]Coach spotting gymnast during routine (touch) 0.50 [/FONT]
[FONT=Arial,Arial]Plus deduction for any part of complete element assisted by the coach. The maximum deduction of a single Element performed is not to exceed the value of the element minus .10. Example – Value of an element is .60, maximum deduction of .50 (this does not include deduction for fall, if any) Even though the gymnast will receive a 0.50 deduction for any touch or spot, the stated deductions will allow the gymnast to receive partial credit for any part of any element that she completed unassisted at the judge’s discretion.[/FONT]
[FONT=Arial,Arial]If a gymnast falls while being spotted on any element, she would only receive 0.50 deduction for the fall along with any deductions for incomplete element, not to exceed the value of the element minus .10. [/FONT]
[FONT=Arial,Arial]A bit like reading tax law to me![/FONT]
[FONT=Arial,Arial]Maybe others can help....[/FONT]
[FONT=Arial,Arial]Either[/FONT]
[FONT=Arial,Arial][A] .50 for the touch...PLUS up to another .50 taken from the value of the skill itself?[/FONT]
[FONT=Arial,Arial]-or-[/FONT]
[FONT=Arial,Arial]....eh, maybe not a B? That word "Plus" would certainly indicate that there is a straight .50, plus value lost for the skill itself[/FONT]
(note: this was a 2005 USAG document)