Two varieties of logarithmic graph paper are commonly available. One, known as semi-log or single log paper, has a standard scale on the x-axis and a logarithmic scale on the y-axis. If given data satisfy an equation y=bax (where a and b are constants), exhibiting exponential growth, then on this special graph paper the corresponding points lie on a straight line. The other variety is known as log–log or double log paper and has a logarithmic scale on both axes. In this case, data satisfying y=bxm (where b and m are constants) produce points that lie on a straight line. Given some experimental data, such logarithmic plotting on one variety or the other of logarithmic graph paper can be used to determine what relationship might have given rise to such data.