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/** Get the x position of the track at z=0 */
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double get_x0() const { return _x0; }
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64
/** Set the x position of the track at z=0 */
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void set_x0(double x0) { _x0 = x0; }
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70
/** Get the gradient of the line in x-z */
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double get_mx() const { return _mx; }
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76
/** Set the gradient of the line in x-z */
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void set_mx(double mx) { _mx = mx; }
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82
/** Get the chi_2 of the line fit in x-z */
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double get_x_chisq() const { return _x_chisq; }