The following data was measured by P. Yvonne Barnes at NIST using the Spectral Tri-function Automated Reference Reflectometer (STARR). This is a monochrometer-based device capable of measuring specular and diffuse reflectance, and regular and diffuse transmittance at multiple wavelengths. This instrument was used to measure the grey metallic sample at incident angles from +15° to +60° and observation angles from +75° to -75° both at 15° intervals. For each measurement position, the entire visible spectrum from 380 to 780 nm was covered at 10 nm steps.
This and other data will be made available directly from NIST at a later time.
The data is in comma-separated ASCII columns with a descriptive header. If a column value is the same as the one in the row above it, no data element is recorded.