Minimize This!

If a\color{#D61F06}{a} and b\color{#3D99F6}{b} are positive, what is the minimum possible value of ab+ba?\large \frac { \color{#D61F06}{a}}{ \color{#3D99F6}{b} } +\frac { \color{#3D99F6}{b} }{\color{#D61F06}{a} }?

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