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More specifically , a spatial Gaussian process regression model is first developed to model part porosity as a function of SLM process parameters .
 concept or principle: Gaussian; concept or principle: regression model; concept or principle: model; machanical property: porosity; material: as; manufacturing process: SLM; concept or principle: process parameters
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: Gaussian, regression model, model, porosity, as, SLM, process parameters 
Answer:
 concept or principle: Gaussian; concept or principle: regression model; concept or principle: model; machanical property: porosity; material: as; manufacturing process: SLM; concept or principle: process parameters