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We present high signal-to-noise ratio, multi-frequency polarization pulseprofiles for 24 millisecond pulsars that are being observed as part of theParkes Pulsar Timing Array (PPTA) project. The pulsars are observed in threebands, centred close to 730, 1400 and 3100 MHz, using a dual-band 10 cm/50 cmreceiver and the central beam of the 20 cm multibeam receiver. Observationsspanning approximately six years have been carefully calibrated and summed toproduce high S/N profiles. This allows us to study the individual profilecomponents and in particular how they evolve with frequency. We also identifypreviously undetected profile features. For many pulsars we show that pulsedemission extends across almost the entire pulse profile. The pulse componentwidths and component separations follow a complex evolution with frequency; insome cases these parameters increase and in other cases they decrease withincreasing frequency. The evolution with frequency of the polarizationproperties of the profile is also non-trivial. We provide evidence that thepre- and post-cursors generally have higher fractional linear polarization thanthe main pulse. We have obtained the spectral index and rotation measure foreach pulsar by fitting across all three observing bands. For the majority ofpulsars, the spectra follow a single power-law and the position angles follow a$\lambda^2$ relation, as expected. However, clear deviations are seen for somepulsars. We also present phase-resolved measurements of the spectral index,fractional linear polarization and rotation measure. All these properties areshown to vary systematically over the pulse profile.

A Study of Multi-frequency Polarization Pulse Profiles of Millisecond Pulsars