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I just figured out another way of doing it with one (reg) layer mask.

You have to have the white BG though.

Add a layer mask to your image, select your gradient tool and the "Foreground to transparent" gradient. Apply the gradient to the left side of the mask first moving the cursor from left to right, tick the "reverse" box and apply the gradient to the right side of the mask STILL moving the cursor from left to right!

Or, in other words, click the reverse box and just apply the gradient always working from the center outward on either side!