You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "v1_stars", "description": "Fetches a list of stars matching specified parameters with a maximum of 30 results per request. To access more than 30 results, use the offset parameter to paginate through multiple API calls.", "parameters": {"min_distance_light_year": {"description": "Minimum distance of the star from Earth in light years.", "type": "int, optional", "default": ""}, "min_apparent_magnitude": {"description": "Minimum apparent magnitude (brightness) of the star.", "type": "int, optional", "default": ""}, "constellation": {"description": "Identifier of the constellation the star belongs to.", "type": "int, optional", "default": ""}, "max_apparent_magnitude": {"description": "Maximum apparent magnitude (brightness) of the star.", "type": "int, optional", "default": ""}, "offset": {"description": "Number of results to skip for pagination.", "type": "int, optional", "default": ""}, "name": {"description": "Name of the star. Note that many star names contain Greek characters. Default is 'vega'.", "type": "str, optional", "default": "vega"}, "max_absolute_magnitude": {"description": "Maximum absolute magnitude (brightness) of the star.", "type": "int, optional", "default": ""}, "min_absolute_magnitude": {"description": "Minimum absolute magnitude (brightness) of the star.", "type": "int, optional", "default": ""}, "max_distance_light_year": {"description": "Maximum distance of the star from Earth in light years.", "type": "int, optional", "default": ""}}}, {"name": "carbonfootprintfrompublictransit", "description": "Calculates the CO2 emissions in kilograms from the use of public transportation based on the distance traveled and type of transit.", "parameters": {"distance": {"description": "The distance traveled in kilometers.", "type": "str", "default": "1000"}, "type": {"description": "The type of transportation, one of: 'Taxi', 'ClassicBus', 'EcoBus', 'Coach', 'NationalTrain', 'LightRail', 'Subway', 'FerryOnFoot', 'FerryInCar'.", "type": "str", "default": "Taxi"}}}, {"name": "get_tamil_calendar_date", "description": "Fetches the Tamil calendar date corresponding to the given English calendar date using the Yawin Indian Astrology API.", "parameters": {"date": {"description": "The English calendar date in the format 'YYYY-MM-DD'.", "type": "str", "default": "2023-04-14"}}}, {"name": "convert_planet_angle_to_planet_degree", "description": "Convert a planet angle to degree format using the Yawin Indian Astrology API.", "parameters": {"angle": {"description": "The planet angle string to be converted (e.g., '67.34.0').", "type": "str", "default": "67.34.0"}}}]
What is the carbon footprint of a 500km national train journey?
user
assistant
[{"name": "carbonfootprintfrompublictransit", "arguments": {"distance": "500", "type": "NationalTrain"}}]