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The very few open clusters I've done, I've tended to process them to just show the cluster stars as isolated blinding jewels against blackness.
You've taken a completely different tack, showing them in context. And from your image one gets some sense of how a rare and short-lived, bright blue OB cluster star can be ten thousand times more luminous than the billions of far longer lived run of the mill faint orange fellows in the background.
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