6750
Laser processing parameters such as the laser power , scanning speed , and hatch spacing were modified to evaluate their effects on the porosity , microstructure , and mechanical properties at high temperatures .
 Laser processing, as, laser power, scanning speed, hatch spacing, porosity, microstructure, mechanical properties, temperatures
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:
 Laser processing, as, laser power, scanning speed, hatch spacing, porosity, microstructure, mechanical properties, temperatures