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Figure 1a: Impedance functions for the gravity-type accessibility measures: Power function.
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Figure 1b: Impedance functions for the gravity-type accessibility measures: Exponential function.
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Figure 1c: Impedance functions for the gravity-type accessibility measures: Gaussian function.
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Figure 1d: Various impedance functions compared.
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Figure 2a: Accessibility surface of the gravity-type measure: POW 1.5.
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Figure 2b: Accessibility surface of the gravity-type measure: EXP 0.45.
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Figure 3a: Accessibility surface of the cumulative-opportunity measure: CUMR 20.
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Figure 3b: Accessibility surface of the cumulative-opportunity measure: CUML 20.
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Figure 4a: Accessibility surface of the space-time measure: MHWA.
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Figure 4b: Accessibility surface of the space-time measure: FHWA.
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