Abbreviations
ANOVA		ANalysis Of VAriance
MMC		Metal matrix composite
RTI			Reflectance transformation imaging
SGCLR		Surface gradient characterization by light reflectance
Roughness parameters
S10z			Ten point height
Sa			Arithmetic mean height
Svi			Valley fluid retention index
Mechanical parameters
α			Ceramic phase
β			Metal phase
d			Depth of scratch
Hv			Hardness
KIc			Fracture toughness
Lc			Crack length
w			Width of scratch
RTI and curvature parameters
ϕ			Azimuth
θ			Elevation
H			Mean curvature
K1			Minimum principal curvature
K2			Maximum principal curvature
Kg			Gaussian curvature
KMehlum		Mehlum curvature
Multiscale and statistical parameters
ε			Cutoff length
F			Relevance