It's important to know the cup-without-handle base and cup-with-handle base, two classic stock chart patterns. Chartists also need to make sure they're familiar with a related structure, which IBD has dubbed the saucer base. As you might guess, the saucer is a shallower pattern than the cup. You might see a correction of about 12% to 20%, while a typical cup can run as deep as 35%. Sometimes a stock will tack on a handle to its saucer base. Other