After the image is pasted the marquee frame is still active. The frame can be moved by grabbing any part of the image with the mouse and moving it to the desired location. The image can be moved as many times as necessary as long as the marquee is active. Once it is deactivated with Select - None or by clicking outside the marquee the image will permanently overwrite the image underneath. Sometimes when for instance lanes from different gels are combined the lengt of the lanes are unequal.
Square boxes appear in the corners of the selected part.
By grabbing one of the boxes the images can be scaled to desired size. The image is accepted by clicking inside the selection once.