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/** @def D2R
* @brief Degrees to radians conversion factor.
*
* Factor @f$\pi/180^\circ@f$ to convert from degrees to radians.
*/
/** @def R2D
* @brief Radians to degrees conversion factor.
*
* Factor @f$180^\circ/\pi@f$ to convert from radians to degrees.
*/
/** @def SQRT2
* @f$\sqrt{2}@f$, used only by molset() (<B><TT>MOL</TT></B> projection).
*/
/** @def SQRT2INV
* @f$1/\sqrt{2}@f$, used only by qscx2s() (<B><TT>QSC</TT></B> projection).
*/
/** @def UNDEFINED
* @brief Value used to indicate an undefined quantity.
*
* Value used to indicate an undefined quantity (noting that NaNs cannot be
* used portably).
*/
/** @def undefined
* @brief Macro used to test for an undefined quantity.
*
* Macro used to test for an undefined value.
*/
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