Table 1.

The features parameters definition.

Feature	Definition	Description
Group I
S1	$\mathrm{\Delta }{\mathrm{V}}_{\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}={\mathrm{V}}_{\mathrm{gas}\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}-{\mathrm{V}}_{\mathrm{air}\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}$	The response value with CuSb2O6‐SE
S2	$\mathrm{\Delta }{\mathrm{V}}_{\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}={\mathrm{V}}_{\mathrm{gas}\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}-{\mathrm{V}}_{\mathrm{air}\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}$	The response value with NiSb2O6‐SE
S3	$\mathrm{\Delta }{\mathrm{V}}_{\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6}={\mathrm{V}}_{\mathrm{gas}\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6}-{\mathrm{V}}_{\mathrm{air}\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6}$	The response value with MgSb2O6‐SE
Group II
${\mathrm{R}}_1^1$	$\mathrm{\Delta }{\mathrm{V}}_{\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}/\mathrm{\Delta }{\mathrm{V}}_{\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}$	First‐order response value ratio
${\mathrm{R}}_2^1$	$\mathrm{\Delta }{\mathrm{V}}_{\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6}/\mathrm{\Delta }{\mathrm{V}}_{\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}$	First‐order response value ratio
${\mathrm{R}}_3^1$	$\mathrm{\Delta }{\mathrm{V}}_{\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6}/\mathrm{\Delta }{\mathrm{V}}_{\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}$	First‐order response value ratio
Group III
${\mathrm{R}}_1^2$	${\mathrm{\Delta }\mathrm{V}}_{\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}^2/(\mathrm{\Delta }{\mathrm{V}}_{\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}\ast \mathrm{\Delta }{\mathrm{V}}_{\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6})$	Second‐order response value ratio
${\mathrm{R}}_2^2$	${\mathrm{\Delta }\mathrm{V}}_{\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6}^2/(\mathrm{\Delta }{\mathrm{V}}_{\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}\ast \mathrm{\Delta }{\mathrm{V}}_{\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6})$	Second‐order response value ratio
${\mathrm{R}}_3^2$	${\mathrm{\Delta }\mathrm{V}}_{\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}^2/(\mathrm{\Delta }{\mathrm{V}}_{\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}\ast \mathrm{\Delta }{\mathrm{V}}_{\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6})$	Second‐order response value ratio
Group IV
${\mathrm{R}}_1^3$	${\mathrm{\Delta }\mathrm{V}}_{\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}^2/\mathrm{\Delta }{\mathrm{V}}_{\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}$	Third‐order response value ratio
${\mathrm{R}}_2^3$	${\mathrm{\Delta }\mathrm{V}}_{\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6}^2/\mathrm{\Delta }{\mathrm{V}}_{\mathrm{NiS}{\mathrm{b}}_2{\mathrm{O}}_6}$	Third‐order response value ratio
${\mathrm{R}}_3^3$	${\mathrm{\Delta }\mathrm{V}}_{\mathrm{MgS}{\mathrm{b}}_2{\mathrm{O}}_6}^2/\mathrm{\Delta }{\mathrm{V}}_{\mathrm{CuS}{\mathrm{b}}_2{\mathrm{O}}_6}$	Third‐order response value ratio