No sir, they're .txt files (amounts of velocity versus time, which i got them from several earthquake records by using SeismoSignal software); anyway i can have images of them separately .but i still don't know how use them for my goal.
So, you are writing you can have images. Hence, I am suggesting to save all desired images into separate image files (let say .png format will work). Finally, in any sophisticated image editing application you are able "to scale" several images together on one image. I will recommend Paint.net - an image and photo editing software for PCs that run Windows.