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Bulk porosity values obtained from micro computed tomography ( μCT ) scan data placed the bulk porosity of the samples combining more than one layer thickness , in between of the results for control specimens , which were manufactured by applying a single layer thickness throughout the samples .
 Bulk porosity, computed tomography, data, bulk porosity, samples, layer thickness, manufactured, layer thickness, samples
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:
 Bulk porosity, computed tomography, data, bulk porosity, samples, layer thickness, manufactured, layer thickness, samples