In her recent book,The Author at Work, (2013),Jenna Blum explains that "Hemingway said that only the tip of the iceberg showed in fiction...but the knowledge that you have about your character that never makes it into the story acts as the bulk of the iceberg. And that is what gives your story weight and gravitas."
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Answered by Aslan
Some critics feel Hemingway leaves gaps in his narrative both in setting and character. I don't have the article you are referring to but perhaps you can relate this point to it.