Integrated intensity maps of (a) CH₃¹⁸OH (5₀–4₀ E), (b) CH₃¹⁸OH (5₁–4₁ E), (c) CH₃¹⁷OH (5₀ −4₀ E), (d) CH₃¹⁷OH (5₋₁–4₋₁ E), (e) CH₃¹⁷OH (5₃–4₃ E), (f) CH₃¹⁷OH (5₁–4₁ E), (g) CH₃¹⁷ OH (5₋₂–4₋₂ E), and (h) CH₃¹⁷OH (5₂–4₂ E). The contour levels are (a) from 4.8 K km s⁻¹ (3σ) to 19.2 K km s⁻¹ with a 4.8 K km s⁻¹ step, (b) from 4.8 K km s⁻¹ (3σ) to 24.0 K km s⁻¹ with a 4.8 K km s⁻¹ step, (c) from 2.3 K km s⁻¹ (3σ) to 11.3 K km s⁻¹ with a 2.3 K km s⁻¹ step, (d) from 2.3 K km s⁻¹ (3σ) to 8.4 K km s⁻¹ with a 1.5 K km s⁻¹ step, (e) from 2.3 K km s⁻¹ (3σ) to 21.3 K km s⁻¹ with a 3.8 K km s⁻¹ step, (f) from 4.8 K km s⁻¹ (3σ) to 8.4 K km s⁻¹ with a 1.5 K km s⁻¹ step, (g) from 4.8 K km s⁻¹ (3σ) to 18.2 K km s⁻¹ with a 2.3 K km s⁻¹ step, and (h) from 2.3 K km s⁻¹ (3σ) to 13.6 K km s⁻¹ with a 2.3 K km s⁻¹ step. The white ellipses in the bottom left corner indicate the synthesized beams. The symbols shown in the maps are the same as those in Figure 1.