1824
Of the four metrics tested , the average avalanching angle , while statistically dependent of the powders angle of repose , showed poor correlation with experimental data .
 average, powders, experimental data
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:
 average, powders, experimental data