Flickr Photo urls size suffixes along with url returned from apis

flickr_urls

url_sq : s	small square 75x75
url_q  : q	large square 150x150
url_t  : t	thumbnail, 100 on longest side
url_s  : m	small, 240 on longest side
url_n  : n	small, 320 on longest side
url_m  : -	medium, 500 on longest side
url_z  : z	medium 640, 640 on longest side
url_c  : c	medium 800, 800 on longest side†
url_l  : b	large, 1024 on longest side*
url_o  : o	original image, either a jpg, gif or png, depending on source format



* Before May 25th 2010 large photos only exist for very large original images.

† Medium 800 photos only exist after March 1st 2012.

Note: Original photos behave a little differently. They have their own secret 
(called originalsecret in responses) and a variable file extension (called originalformat in responses). 
These values are returned via the API only when the caller has permission to view the original size 
(based on a user preference and various other criteria). 

Thanks

Here's an update: https://www.flickr.com/services/api/misc.urls.html