" Ask Quantity " is a Coloumn which gives the details about the Quantity @ Particular Price.
" Total Ask Quantity " is a Value of Sum of Total " Ask Quantity "
bid quantity - it means price that buyer is ready to pay for any stock or commodity..
ask quantity - it means price at which seller is ready to sell any stock or commodity..
total bid quanity - it means total number of buyers in that particular stock or commodity.
total ask quantity - it means total number of seller in that particular stock or commodity..
you can also check this link.. to get full knowledge on volumes..