Why would both frame and divider conductances be 500 W/m2-K?

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I have the 4 objects in my WindowProperty:FrameAndDivider class and I am struggling to understand what each of those are representing, such they are all so similar, but with major differences, specially their conductances. Here they are: (I will highlight the relevant fields alone)

1,                       !- Name
9.5,                     !- Frame Conductance {W/m2-K}
0.5,                     !- Frame Solar Absorptance
0.5,                     !- Frame Visible Absorptance
0.9,                     !- Frame Thermal Hemispherical Emissivity
DividedLite,             !- Divider Type
9.5,                     !- Divider Conductance {W/m2-K}
0.5,                     !- Divider Solar Absorptance
0.5,                     !- Divider Visible Absorptance
0.9,                     !- Divider Thermal Hemispherical Emissivity
0.5,                     !- Outside Reveal Solar Absorptance
0.5;                     !- Inside Reveal Solar Absorptance


2,                       !- Name
500,                     !- Frame Conductance {W/m2-K}
0.3,                     !- Frame Solar Absorptance
0.3,                     !- Frame Visible Absorptance
0.3,                     !- Frame Thermal Hemispherical Emissivity
DividedLite,             !- Divider Type
500,                     !- Divider Conductance {W/m2-K}
0.3,                     !- Divider Solar Absorptance
0.3,                     !- Divider Visible Absorptance
0.3,                     !- Divider Thermal Hemispherical Emissivity
0.3,                     !- Outside Reveal Solar Absorptance
0.3;                     !- Inside Reveal Solar Absorptance

3,                       !- Name
9.5,                     !- Frame Conductance {W/m2-K}
0.5,                     !- Frame Solar Absorptance
0.5,                     !- Frame Visible Absorptance
0.9,                     !- Frame Thermal Hemispherical Emissivity
,                        !- Divider Type
9.5,                     !- Divider Conductance {W/m2-K}
0.5,                     !- Divider Solar Absorptance
0.5,                     !- Divider Visible Absorptance
0.9,                     !- Divider Thermal Hemispherical Emissivity
0.5,                     !- Outside Reveal Solar Absorptance
0.5;                     !- Inside Reveal Solar Absorptance

4,                       !- Name
500,                     !- Frame Conductance {W/m2-K}
0.3,                     !- Frame Solar Absorptance
0.3,                     !- Frame Visible Absorptance
0.3,                     !- Frame Thermal Hemispherical Emissivity
,                        !- Divider Type
500,                     !- Divider Conductance {W/m2-K}
0.3,                     !- Divider Solar Absorptance
0.3,                     !- Divider Visible Absorptance
0.3,                     !- Divider Thermal Hemispherical Emissivity
0.3,                     !- Outside Reveal Solar Absorptance
0.3;                     !- Inside Reveal Solar Absorptance

Does anybody have any idea of what that 500 W/m2.K represent? I thought of eventual infiltrations, but those are already being addressed in the ZoneInfiltration:DesignFlowRate class.

Thanks in advance for any help.