3241
Finally , the influence of different primary accelerating gases ( helium vs nitrogen ) on the material properties of the deposits was investigated .
 helium, nitrogen, material properties
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:
 helium, nitrogen, material properties