Method ViewData

@param spectra an array of spectra @param yPt1 @param yPt2 @param startList the start indices @param endList the end indices @param isContinuous @param is2D @returns an instance of MultiScaleData

(Lst<Spectrum> spectra, double yPt1, double yPt2,
			int[] startList, int[] endList, boolean isContinuous, boolean is2D)