This graphic is 100% vector using both cell shading and gradient mesh techniques. Originally I had drawn this as a detail for a small presentation but is now available to you for FREE here!
If at all possible I do request that you link back to my website - http://www.jjmasse.com in response to using this graphic.
If you have something you would like drawn for you, feel free to send me a message requesting what you would like to have drawn.