interface_build {
    {s.sv2svfit} 0
    {Create sample semivariagram for sites list and fit it to model.}
    {entry sites {Input sites list to use for semivariogram:} 0 sites}
    {entry lag {Nominal lag distance:} 0 ""}
    {entry lagtol {Tolerance on lag distance [default=1/2 normal distance):} 0 ""}
    {entry direction {Direction of semivariogram [default=omnidirectional]:} 0 ""}
    {entry angtol {Angular tolerance on direction:} 0 ""}
    {entry field {Number of sites attribute field to use for calculation [default=1]:} 0 ""}
    {checkbox model {Fit to linear model:} "" 1}
    {checkbox model {Fit to spherical model:} "" 2}
    {checkbox model {Fit to exponential model:} "" 3}
    {checkbox model {Fit to gaussian model:} "" 4}
    {checkbox model {Fit to quadratic model:} "" 5}
    {checkbox model {Fit to wave or hole effect model:} "" 6}
    {entry range {Semivariogram range:} 0 ""}
    {entry graph {Output results to GNUPlot *.gp and *.dat format (implies -p; print to screen if blank):} 0 file}
    {checkbox -p {Save output to GNUplot files} "" -p}
    {checkbox -w {Use weighted least squares [default is general least squares]} "" -w}
    {checkbox -q {Run quietly} "" -q}
}