Data Set Descriptions

Data Set S1. Raw SINS spectra for studied samples (sections 1{4 and the terrestrial
anorthite standard). The compressed folder contains copies of the raw spectrum files in
the generally-accessible .CSV format. The original files, in proprietary .SPA format, are
excluded from this Data Set due to file-size constraints. Copies of the .SPA files can be
made available to interested parties upon request. These files are organized by section
and scan.

Data Set S2. This dataset is comprised of background-referenced and Fourier-transformed
SINS spectra (.CSV). Note that both the amplitude and phase signals are
included here. The relevant folders additionally contain the background spectral files
(.CSV) that were used. These files are organized by section and scan.

Data Set S3. The compressed folder contains the initial conditions for the iterative fitting
model as well as the peak parameters calculated thereby. These data are formatted as
.CSV files.

Data Set S4. The compressed folder contains 16 animated .GIF files (one for each
linescan) displaying the fitted phase spectra from each point in the line-scan.

Data Set S5. The individual frames of the animations included in Data Set S4. Files
are saved in .PNG format with a name in the style of:
\S[Sample #]_LS[Scan #]_[Depth]nm_[Phase/Amp].png