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The key design parameters of FGM include the dimension of the gradient vector , the geometric shape and the repartition of the equipotential surfaces .
 engineering feature: design; manufacturing process: FGM; engineering feature: dimension; engineering feature: geometric shape; concept or principle: equipotential surfaces
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 engineering feature: design; manufacturing process: FGM; engineering feature: dimension; engineering feature: geometric shape; concept or principle: equipotential surfaces