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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _cas_1(self):
        '''1 - The desired structure is entirely contained into one image.'''

        lonc = self._format_lon(self.lonm)
        latc = self._format_lat(self.latm)
        img = self._format_name_map(lonc, latc)
        img_map = BinaryTable(img, self.path_pdsfiles)

        return img_map.extract_grid(self.lonm, self.lonM, self.latm, self.latM)