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This is a Gazebo question, which should be asked in that forum, but to give you a quick answer:

The standard sensor plugins aren't any particular models; they just model a generic sensor of that type. It's up to you to define the parameters that reflect a certain manufacturer's specifications. There are, however, some custom plugins that are intended to accurately represent particular sensors. The plugin a robot model uses is defined in (or referenced by) its URDF file, so look there to see the specific plugin library and parameters.