What are the elements of the ideal tragic plot?

According to Aristotle, the six elements of a tragedy are the following:

1. Plot - it must be a complete story with a beginning, middle, and end; it must be "of a certain magnitude" (of sufficient seriousness and complexity)
2. Character - they must be realistic, logical, and "true to life yet more beautiful."
3. Thought - "where something is proved to be or not to be, or a maxim is enunciated."
4. Diction - "the expression of the meaning in the Words."
5. Song or melody - Greek tragedies were musical plays
6. Spectacle - if you're talking about a play