==:File:N-type SBQWRTT barrier layer thickness.jpg== 
 It would also be appreciates if you could add   
 * 1-2 paragraphs explaining what is shown in the image. 
 * Give some indication as to the data sources on which this image is based  

 As well as helping those categorising the image, it will help place the image in context and allow other users of the image (including academics) to make better use of the image )