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	Figure 1: a) SOHO-MDI 11:11 UT magnetogram, N is top, E is left, axes in arcsec. Numbers: NOAA active regions as 10xxx. The white box encloses the field considered in Fig. 3b. b) SOHO-EIT 195 Å image (11:47 UT). Asterisk: decimeter-meter continuum (DMCS). "+'': RHESSI HXR footpoint source centroids in the flaring AR 10486 on 11:06 UT.
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In the text

Figure 2: a) 327 MHz flux of DMCS (*, in solar flux units 10-22 W s m-2) together with the normalized GOES 0.5-4 Å X-ray flux (off-scale from 11:06-11:15 UT). Note the flash at the impulsive onset, and the 6 min pulse in the main phase during proton injection onset (the dark bar, and Klassen et al. 2005). b) View from W, top is E, right is N, on the magnetogram Fig. 1a with RHESSI HXR sources ("+'' on white spot) and 2 field lines from fiber burst analysis (dark, see P1). White circle and column: projected site and height of the DMCS, see Fig. 1b.

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In the text

Figure 3: N(x,y) after Eq. (1). Dark shading means  , white is N=0. Axes in arcsec, N is top, E is left. a) N(x,y) plotted in three regions (between ARs 10486 and 10488) according to the monopole model of the central part of the magnetogram Fig. 1a. The symbols depict monopoles: "+'' means white, dark dots mean dark-plotted polarity in Fig. 1a. b) The small central box in panel a): Y-shaped displacement gradient pattern near the DMCS. Dots: DMCS centroids at NRH frequencies: S1&S2-327 MHz; S3-410.5 MHz; S4-432 MHz. Boxes (A) and (B) are considered in Fig. 4.

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In the text

Figure 4: The Y-shaped pattern in N(x,y) of Fig. 3b, boxes (A) and (B), with photospheric (model) field line footpoints of a 0.5 arcsec grid. The flux cells are color-coded: toward AR 10488 - Red, AR 10486 - Blue, AR 10491 - Green. Grey-shaded are pixels with extreme displacement gradient (see text). a) The eastern part of the Y with the widest-east extended green flux-cell footpoints. b) The Y branch point.

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In the text

	Figure 5: Field lines stemming from Fig. 4a, grey pixels only. Scales in arcsec. a) Top view. b) Perspective view from NE. Colors give the flux-cell association. Overplotted are the Y-pattern and the coronal radio sources as bold dots from Fig. 3b. AR numbers are given to connect this figure with Fig. 1a.
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In the text