A user-friendly interface was developed in Excel (Microsoft Office) to deal with spectroscopic and chromatographic data. The Excel spreadsheet includes baseline correction, area and height determination, and identification of variables that represent the maximum height. Excel's performance. StellarNet offers the customizable StellarNet VBA programs for MS Excel that instantly grabs and graphs data from a StellarNet spectrometer. Setup and run from Excel in absorbance, transmission, or scope mode. With our VBA modules, you can rapidly customize your spectral analysis to meet your. John Wiley & Sons, New York], and correspond to activity data of the sun. The time series is composed by 176 data covering years 1749 to 1924.