Table 5: Modeling of the southern magnetic arm of NGC 4254 by stretching/shearing and compression processes. The radio properties of the N magnetic arm are regarded as the initial conditions for the S magnetic arm (region 3 and 1 in Table 2, respectively). The compression and stretching factors were adjusted so as to yield the observational values (given in italics) of synchrotron emissivity ratio S₂/S₂ or the degree of polarization in the southern arm p₂ (see Sect. 3.4).
stretching $\eta$ or S₂/S₁ p₂

compression $\zeta$ factor

Observed - $2.0\pm 0.2$ $0.37\pm 0.03$

Stretching 1.53 2.0 0.39

Stretching 1.47 1.8 0.37

Compression 1.24 2.0 0.29

Compression 1.84 8.1 0.37

**Table 5:** Modeling of the southern magnetic arm of NGC 4254 by stretching/shearing and compression processes. The radio properties of the N magnetic arm are regarded as the initial conditions for the S magnetic arm (region 3 and 1 in Table 2, respectively). The compression and stretching factors were adjusted so as to yield the observational values (given in italics) of synchrotron emissivity ratio S₂/S₂ or the degree of polarization in the southern arm p₂ (see Sect. 3.4).
	stretching $\eta$ or	S₂/S₁	p₂
	compression $\zeta$ factor
Observed	-	$2.0\pm 0.2$	$0.37\pm 0.03$
Stretching	1.53	2.0	0.39
Stretching	1.47	1.8	0.37
Compression	1.24	2.0	0.29
Compression	1.84	8.1	0.37

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