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Depolarizers
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There are often circumstances when a plane polarized beam can be undesirable, as for instance, with a polarization sensitive instrument such as a reflecting spectrometer. A depolarizer will change this beam into a pseudo-depolarized beam by scrambling up the polarization. Depolarizers made from crystal quartz/fused silica transmit down to 220nm, as the two components are optically contacted. Two types of device are offered - Lyot depolarizers and wedge depolarizers. Both types are optically contacted components.
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Quartz Lyot Depolarizers
This LDQ series of achromatic depolarizers comprises two synthetic crystal quartz plates assembled with their optic axes lying in the plane of the plates, aligned at 45°. One plate is exactly twice the thickness of the other. Depolarization is caused by varying amounts of circular and elliptically polarized light at different wavelengths; it is thus not effective with monochromatic light.
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Quartz/Silica Wedge Depolarizers
The WDQ series of depolarizers comprises a crystalline quartz wedge together with a compensating fused silica wedge to correct the angular deviation. The optic axis of the quartz wedge lies in the plane of the wedge and at 45° to the input polarization. The result is then a variable retardation plate over the aperture which produces depolarization for all wavelengths.
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MgF2/LiF wedge depolarizers
This WDM series of depolarizers comprises a magnesium fluoride wedge together with a compensating lithium fluoride wedge to correct the angular deviation. The optic axis of the magnesium fluoride wedge lies in the plane of the wedge and at 45° to the input polarization. The result is then a variable retardation plate over the aperture which produces depolarization for all wavelengths.
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Mounts
Depolarizers can be supplied unmounted as free components or mounted as shown. The mount comprises a black anodised aluminium ring with silicone rubber shock absorbing material between the ring and the depolarizer. To specify mounted depolarizers, simply add suffix:
M3 for Type 3 mount (shown)
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Specifications
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Model #
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Material
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Aperture (mm)
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Spectral Range (nm)
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Peak Trans. (%)
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Beam Dev. (min)
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Flatness @NaD
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Max Peak Power (MW/cm2)
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Max CW Power (W/cm2)
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Mount Dia. (mm)
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Mount Length (mm)
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Quartz Lyot Depolarizers
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LDQ10
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quar/quar
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10
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220-2600
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92
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<3
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lambda/8
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200
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100
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25.4
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10
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LDQ15
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quar/quar
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15
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220-2600
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92
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<3
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lambda/8
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200
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100
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25.4
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10
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LDQ20
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quar/quar
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20
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220-2600
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92
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<3
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lambda/8
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200
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100
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31.8
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10
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LDQ25
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quar/quar
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25
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220-2600
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92
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<3
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lambda/8
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200
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100
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38.1
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10
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LDQ38
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quar/quar
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38
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220-2600
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92
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<3
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lambda/8
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200
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100
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50.8
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10
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LDQ50
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quar/quar
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50
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220-2600
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92
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<3
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lambda/8
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200
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100
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63.5
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10
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Quartz/Silica Wedge Depolarizers
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WDQ10
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quar/sil
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10
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220-2600
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92
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<3
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lambda/8
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200
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100
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25.4
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10
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WDQ15
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quar/sil
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15
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220-2600
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92
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<3
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lambda/8
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200
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100
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25.4
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10
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WDQ20
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quar/sil
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20
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220-2600
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92
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<3
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lambda/8
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200
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100
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31.8
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10
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WDQ25
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quar/sil
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25
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220-2600
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92
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<3
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lambda/8
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200
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100
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38.1
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10
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WDQ38
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quar/sil
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38
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220-2600
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92
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<3
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lambda/8
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200
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100
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50.8
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10
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WDQ50
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quar/sil
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50
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220-2600
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92
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<3
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lambda/8
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200
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100
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63.5
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10
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MgF2-LiF Wedge Depolarizers
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WDM10
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MgF/LiF
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10
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120-5000
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92
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<3
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lambda/8
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200
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100
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25.4
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10
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WDM15
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MgF/LiF
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15
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120-5000
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92
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<3
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lambda/8
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200
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100
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25.4
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10
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WDM20
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MgF/LiF
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20
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120-5000
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92
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<3
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lambda/8
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200
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100
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31.8
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10
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WDM25
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MgF/LiF
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25
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120-5000
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92
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<3
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lambda/8
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200
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100
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38.1
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10
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WDM38
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MgF/LiF
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38
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120-5000
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92
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<3
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lambda/8
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200
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100
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50.8
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10
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WDM50
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MgF/LiF
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50
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120-5000
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92
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<3
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lambda/8
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200
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100
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63.5
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10
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