I am writing a book “Innenwelt – Außenwelt” (in German) which is a follow-up to my publications with World Scientific (“Fractal Time – why a watched kettle never boils” and “Simultaneity – “Temporal Structures and Observer perspectives”).
In my Chapter on pink noise, I would like to illustrate the difference between white, pink and brown noise with your illustration (above) which you generated with Audacity.
Would you please grant me permission to use the illustration in my book “Innenwelt-Außenwelt”?
Website of Jimmy Clark, Instructional Designer 
Dear Professor Clark,
I am writing a book “Innenwelt – Außenwelt” (in German) which is a follow-up to my publications with World Scientific (“Fractal Time – why a watched kettle never boils” and “Simultaneity – “Temporal Structures and Observer perspectives”).
In my Chapter on pink noise, I would like to illustrate the difference between white, pink and brown noise with your illustration (above) which you generated with Audacity.
Would you please grant me permission to use the illustration in my book “Innenwelt-Außenwelt”?
Yours sincerely,
Susie Vrobel