Table 3: Fit parameters describing the shape of the spectra (low-frequency spectral index, break frequency, cutoff frequency) shown in Fig. 12.
Model A Model B/HS

Location r^a $\delta _{y}$ ^b $\alpha_{{\rm low}}$ $\nu_{\rm b}$ $\nu _{\rm c}$ ^c $\alpha_{{\rm low}}$ $\nu_{\rm b}$ $\nu _{\rm c}$

$^{\prime\prime}$ $^{\prime\prime}$ Hz Hz Hz Hz

A 13.0 0.0 -0.35 $1.83\times 10^{10}$ $1.83\times 10^{16}$ $\dagger$ ... ... ...

A-B1 13.7 0.0 -0.38 $2.25\times 10^{9}$ $2.25\times 10^{15}$ -0.38 $2.15\times 10^{9}$ $2.15\times 10^{15}$

B1 14.2 0.1 -0.35 $7.13\times 10^{9}$ $7.14\times 10^{15}$ $\dagger$ ... ... ...

B2 15.2 -0.1 -0.44 $2.78\times 10^{11}$ $3.81\times 10^{16}$ $\dagger$ ... ... ...

B3 15.6 -0.1 -0.48 $2.71\times 10^{11}$ $3.34\times 10^{16}$ -0.46 $1.98\times 10^{11}$ $2.38\times 10^{16}$

B3-C1 16.3 0.0 -0.38 $3.12\times 10^{9}$ $3.13\times 10^{15}$ -0.35 $1.36\times 10^{9}$ $1.36\times 10^{15}$

C1 16.8 0.1 -0.39 $1.65\times 10^{10}$ $5.24\times 10^{15}$ -0.38 $1.59\times 10^{10}$ $3.74\times 10^{15}$

C1-C2 17.3 0.0 -0.37 $1.45\times 10^{11}$ $4.42\times 10^{14}$ -0.35 $1.35\times 10^{11}$ $3.67\times 10^{14}$

C2 17.7 0.0 -0.36 $2.86\times 10^{10}$ $9.38\times 10^{14}$ -0.35 $3.07\times 10^{10}$ $8.19\times 10^{14}$

C2-D1 18.3 0.2 -0.49 $2.39\times 10^{10}$ $7.88\times 10^{15}$ -0.35 $8.65\times 10^{9}$ $5.46\times 10^{14}$

D1 18.9 0.1 -0.48 $1.06\times 10^{10}$ $4.34\times 10^{15}$ -0.35 $9.58\times 10^{8}$ $4.65\times 10^{14}$

D1-D2 19.5 -0.2 -0.35 $4.62\times 10^{9}$ $3.16\times 10^{14}$ -0.35 $5.78\times 10^{9}$ $3.23\times 10^{14}$

D2 19.8 -0.2 -0.35 $7.92\times 10^{9}$ $5.26\times 10^{14}$ -0.35 $9.27\times 10^{9}$ $5.15\times 10^{14}$

H3 20.2 -0.3 -0.39 $2.20\times 10^{9}$ $8.75\times 10^{14}$ -0.35 $1.08\times 10^{9}$ $5.10\times 10^{14}$

H2 21.3 0.0 ... ... ... -0.60 $1.14\times 10^{10}$ $7.50\times 10^{14}$

H1 22.1 -0.2 ... ... ... -0.44 $2.28\times 10^{9}$ $5.79\times 10^{13}$

^a Distance along radius vector.
^b Distance from the radius vector; negative offsets are to the south.
^c The $\dagger$ mark indicates locations where there is no cutoff to the optical spectrum in the observed range and the value given is a lower limit to the true cutoff frequency. Both fits are identical in this case.

**Table 3:** Fit parameters describing the shape of the spectra (low-frequency spectral index, break frequency, cutoff frequency) shown in Fig. 12.
			Model A	Model B/HS
Location	r^a	$\delta _{y}$ ^b	$\alpha_{{\rm low}}$	$\nu_{\rm b}$	$\nu _{\rm c}$ ^c	$\alpha_{{\rm low}}$	$\nu_{\rm b}$	$\nu _{\rm c}$
	$^{\prime\prime}$	$^{\prime\prime}$		Hz	Hz		Hz	Hz
A	13.0	0.0	-0.35	$1.83\times 10^{10}$	$1.83\times 10^{16}$ $\dagger$	...	...	...
A-B1	13.7	0.0	-0.38	$2.25\times 10^{9}$	$2.25\times 10^{15}$	-0.38	$2.15\times 10^{9}$	$2.15\times 10^{15}$
B1	14.2	0.1	-0.35	$7.13\times 10^{9}$	$7.14\times 10^{15}$ $\dagger$	...	...	...
B2	15.2	-0.1	-0.44	$2.78\times 10^{11}$	$3.81\times 10^{16}$ $\dagger$	...	...	...
B3	15.6	-0.1	-0.48	$2.71\times 10^{11}$	$3.34\times 10^{16}$	-0.46	$1.98\times 10^{11}$	$2.38\times 10^{16}$
B3-C1	16.3	0.0	-0.38	$3.12\times 10^{9}$	$3.13\times 10^{15}$	-0.35	$1.36\times 10^{9}$	$1.36\times 10^{15}$
C1	16.8	0.1	-0.39	$1.65\times 10^{10}$	$5.24\times 10^{15}$	-0.38	$1.59\times 10^{10}$	$3.74\times 10^{15}$
C1-C2	17.3	0.0	-0.37	$1.45\times 10^{11}$	$4.42\times 10^{14}$	-0.35	$1.35\times 10^{11}$	$3.67\times 10^{14}$
C2	17.7	0.0	-0.36	$2.86\times 10^{10}$	$9.38\times 10^{14}$	-0.35	$3.07\times 10^{10}$	$8.19\times 10^{14}$
C2-D1	18.3	0.2	-0.49	$2.39\times 10^{10}$	$7.88\times 10^{15}$	-0.35	$8.65\times 10^{9}$	$5.46\times 10^{14}$
D1	18.9	0.1	-0.48	$1.06\times 10^{10}$	$4.34\times 10^{15}$	-0.35	$9.58\times 10^{8}$	$4.65\times 10^{14}$
D1-D2	19.5	-0.2	-0.35	$4.62\times 10^{9}$	$3.16\times 10^{14}$	-0.35	$5.78\times 10^{9}$	$3.23\times 10^{14}$
D2	19.8	-0.2	-0.35	$7.92\times 10^{9}$	$5.26\times 10^{14}$	-0.35	$9.27\times 10^{9}$	$5.15\times 10^{14}$
H3	20.2	-0.3	-0.39	$2.20\times 10^{9}$	$8.75\times 10^{14}$	-0.35	$1.08\times 10^{9}$	$5.10\times 10^{14}$
H2	21.3	0.0	...	...	...	-0.60	$1.14\times 10^{10}$	$7.50\times 10^{14}$
H1	22.1	-0.2	...	...	...	-0.44	$2.28\times 10^{9}$	$5.79\times 10^{13}$

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and data reduction
	3 Photometry
	4 Results
	5 Analysis
	6 Discussion
	7 Summary and future work
	References