*CDK PHOTO2                                                                        PHOTO2.1         
      COMMON/PHOTO2/XNO(IMXP),XN4S(IMXP),XCH4(IMXP),XH2(IMXP),XCO2(IMXP)           PHOTO2.2         
     1  ,XCO(IMXP),XH2O(IMXP)                                                      PHOTO2.3