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Article Contents

ABSTRACT

1.INTRODUCTION

2.GLOBAL PROPERTIES OF M31 AND M33
2.1.Radio continuum spectra
2.2.Magnetic field strengths

3.The 10 kpc "ring" of M31
3.1.Magnetic field structure
3.2.Cosmic rays
3.3.Rotation measures
3.4.Fine structure of the field

4.RADIO HALO AROUND M31 ?

5.THE CENTRAL REGION OF M31

6.THE MAGNETIC FIELD IN M33

7.OUTLOOK

REFERENCES