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For both materials , in situ thermal imaging and post-mortem fractography shows , respectively , rapid cool-down of the rasters during filament deposition and presence of voids between adjacent raster roads ; both of which serve to reduce fracture toughness .
 concept or principle: materials; concept or principle: in situ; application: imaging; process characterization: fractography; material: filament; concept or principle: deposition; concept or principle: voids; concept or principle: fracture
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: materials, in situ, imaging, fractography, filament, deposition, voids, fracture 
Answer:
 concept or principle: materials; concept or principle: in situ; application: imaging; process characterization: fractography; material: filament; concept or principle: deposition; concept or principle: voids; concept or principle: fracture