All Figures

Figure 1: Optical ( top) and radio ( bottom) light curves from 1966 to the end of September 2005; the yellow strip indicates the period of the 2004-2005 WEBT campaign, while grey vertical lines show the times of the satellite pointings (see Fig. 4). Bottom panel: black points indicate the 8 GHz light curve (1489 data points); red, green, and blue curves represent the cubic spline interpolations through the 30-day binned light curves at 5, 14.5, and 37 GHz, respectively; blue points are sparse 37 GHz data. Top panel: besides the R-band light curve (2709 data points, 1502 of which are from the WEBT campaign, blue points), the radio hardness ratios H37/8 (blue line) and H14.5/8 (green line) are plotted as 18-H; the light blue shading highlights where H37/8 is harder than average.

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In the text

Figure 2: Time evolution of the B-R colour index ( top) during the WEBT campaign compared with the R-band light curve ( bottom); orange points in the light curve highlight the R data used to derive the B-R indices; the red curve is a cubic spline interpolation through the 43 GHz light curve, arbitrarily scaled to fit the figure; the light blue strips indicate the epochs of the INTEGRAL ( left) and Chandra ( right) pointings, while the light green and red ones refer to spectra shown in Fig. 4; the red triangles mark the VLBA epochs of Fig. 3.

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In the text

	Figure 3: VLBA maps at 43 GHz; the total intensity is shown by contours from 0.15% up to 76.8% of the August 2005 peak value, increasing by a factor of 2; the straight lines show the electric vector and their length is proportional to the local polarized intensity.
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In the text

	Figure 4: Spectral energy distribution of 3C 454.3 showing contemporaneous radio, near-IR, optical, and X-ray (Chandra and INTEGRAL) data during May 15-20, 2005. Previous data are also plotted for comparison, together with two other spectra from the WEBT campaign (see text for further details).
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In the text