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The 3D-DIC based RS measurements were validated by X-ray diffraction ( XRD ) , with an average error of 6 % between measured and analytically derived stresses .
 process characterization: RS measurements; process characterization: X-ray diffraction; process characterization: XRD; concept or principle: average
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: RS measurements, X-ray diffraction, XRD, average 
Answer:
 process characterization: RS measurements; process characterization: X-ray diffraction; process characterization: XRD; concept or principle: average