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In this work , the topography of electron beam powder bed fusion ( EBPBF ) surfaces as a function of orientation with respect to the build direction was investigated using a combined approach consisting of both texture parameters and feature-based characterisation .
 topography, electron beam, bed fusion, surfaces, as, orientation, build direction, texture, parameters
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 topography, electron beam, bed fusion, surfaces, as, orientation, build direction, texture, parameters