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We show that the melt pool can undergo different melting regimes and both the melt pool dimension and melt pool volume can have orderB-of-magnitude change under a constant input energy density .
 melt pool, melting, melt pool dimension, melt pool, energy density
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:
 melt pool, melting, melt pool dimension, melt pool, energy density