def crop(self, start=None, end=None, copy=False):
for key, val in self.items():<EOL><INDENT>self[key] = val.crop(start=start, end=end, copy=copy)<EOL><DEDENT>return self<EOL>
Crop each entry of this `dict`

        This method calls the :meth:`crop` method of all entries and
        modifies this dict in place.

        Parameters
        ----------
        start : `~gwpy.time.LIGOTimeGPS`, `float`, `str`
            GPS start time of required data,
            any input parseable by `~gwpy.time.to_gps` is fine

        end : `~gwpy.time.LIGOTimeGPS`, `float`, `str`, optional
            GPS end time of required data, defaults to end of data found;
            any input parseable by `~gwpy.time.to_gps` is fine

        See Also
        --------
        TimeSeries.crop
            for more details