ounded 
    by lines of x, y and z nodes.<br>
    In this dialog all cell boundaries can be defined seperately. By changing 
    dx or dy a new (equidistant) vector is constructed. By changing the number 
    of layers and pressing button 1dsens the layer boundaries are determined using 
    1d-sensitivity studies of the whole data set. By editing background resistivities 
    for each layer a general layered model can be set. Note that the length of 
    background and z vector are equal since the last lay