Decreased range of random_rms

imagine/magnetic_fields/wmap3yr_magnetic_field/wmap3yr_magnetic_field_factory.py

@@ -31,7 +31,7 @@ class WMAP3yrMagneticFieldFactory(MagneticFieldFactory):
             'psi0': self._positive_interval(27.0, 5.0, n),  # psi0 astro-ph/0603450
             'psi1': self._positive_interval(0.9, 5.0, n),  # psi1 astro-ph/0603450
             'chi0': self._positive_interval(25, 5.0, n),  # xsi0 astro-ph/0603450
-            'random_rms': self._positive_interval(1.0, 1.0, n),
+            'random_rms': self._positive_interval(1.0, 0.3, n),
             'random_rho': self._positive_interval(0.5, 0.166, n)
         }
         return defaults