# Options of the 2D-COS Control Window

**Type of 2D spectrum**: defines the type of the 2D-COS analysis. Valid options are:

* Pearson scaling - the synchronous 2D spectrum with Pearson, or unit variance scaling. Pearson scaling is also used in statistical total correlation spectroscopy [STOCSY] and statistical heterospectroscopy [SHY]) * Pareto scale 0.75 - the synchronous 2D spectrum with Pareto scaling. The parameter α equals 0.75 * Pareto scale 0.50 - the synchronous 2D spectrum with Pareto scaling. The parameter α equals 0.50 (Pareto scaling in the strict sense) * Pareto scale 0.25 - the synchronous 2D spectrum with Pareto scaling. The parameter α equals 0.25 * stat synchronous - the classical synchronous 2D (covariance) spectrum * stat asynchronous - the classical asynchronous 2D spectrum * disrelation - allows to calculate the absolute of the 2D disrelation spectrum * fft synchronous - alternative implementation to obtain the synchronous 2D correlation spectrum by means of the fast Fourier-transformation approach * fft asynchronous - alternative implementation to obtain the asynchronous 2D correlation spectrum by means of the fast Fourier-transformation approach

**Spectral regions for 2D-COS analysis**: allows to define the [x,y] spectral ranges for 2D-COS analysis

**Type of reference spectrum**: defines the type of reference spectrum to obtain the dynamic spectrum. Valid options are *no reference* (spectrum), *average spectrum* (default), *first spectrum* and *last spectrum*.

**Plot contour map**: plots a contour map instead of an interpolated surface map where the color is proportional to the 2D-COS functional values.

**Fill contour**: creates a filled contour map

**Number of isolines**: defines the number of isolines in contour / filled contour maps

**Select colormap**: the type of color maps used to plot surface maps, or to plot the isolines in contour maps

**Scaling**: permits to modify manually the color map by entering the minimal and maximal z-values into the appropriate edit boxes

**Apply scaling**: color map scaling values are immediately applied to the 2D correlation spectrum

**[x,y] slice coordinates**: settings required to plot 1D correlation slices, or to create [x,y] feature plots