What are the type indications for quantities in MetPy?

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The type indications for quantities in MetPy are:

1. Quantity: This represents a physical quantity with a number and a unit attached to it. For example, Temperature = 20 kelvin.

2. Unit: This represents the unit of measurement for a physical quantity. For example, Kelvin, Celsius, Fahrenheit, etc.

3. Dimensions: These represent the number of independent physical quantities needed to fully specify a physical quantity. For example, temperature has one dimension, while velocity has three dimensions (length, time, and mass).

4. Coordinate: This represents the position of a point in space. For example, longitude and latitude are coordinates for a point on the Earth's surface.