2555
Afterward , an average value of the SWT parameter over a so-called critical area whose center is located at the considered centroid is also calculated , i.e. , the average indicator .
 average, parameter, area, average
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, parameter, area, average