7338
Comparison with several data sets from the literature shows that the simulations correctly predict process conditions at which lack-of-fusion porosity becomes apparent , as well as the rate at which porosity increases with changes in process conditions such as beam speed , layer thickness and hatch spacing .
 data, simulations, process, porosity, as, as, porosity, process, as, layer thickness, hatch spacing
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:
 data, simulations, process, porosity, as, as, porosity, process, as, layer thickness, hatch spacing