'Tuple defining the default ``bounding_box`` limits,
``(x_low, x_high)``
Parameters
factor : float
The multiple of `stddev` used to define the limits.
The default is 5.5, corresponding to a relative error < 1e-7.
Examples
>>> from astropy.modeling.models import Gaussian1D
>>> model = Gaussian1D(mean=0, stddev=2)
>>> model.bounding_box
(-11.0, 11.0)
This range can be set directly (see: `Model.bounding_box
<astropy.modeling.Model.bounding_box>`) or by using a different factor,
like:
>>> model.bounding_box = model.bounding_box(factor=2)
>>> model.bounding_box
(-4.0, 4.0)'

def bounding_box(self, factor=5.5):

    x0 = self.mean
    dx = (factor * self.stddev)
    return ((x0 - dx), (x0 + dx))
