def load_points(filename):
    """
    Splits the contents of the sensors data file into a list of tuples (points)
    :param filename: relative path to the datafile
    :return: list of tuples of floats (coordinates)
    """
    with open(filename, "r") as file:
        # read the whole file (1 line) without the first 2 and last 2 brackets
        string = file.readline()[2:-3]

        # split by points and split each point into 3 numbers
        return [tuple([float(x) for x in point.split(",")]) for point in string.split("},{")]