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diff --git a/Dragon/src/SYB4T4.f b/Dragon/src/SYB4T4.f
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+*DECK SYB4T4
+      SUBROUTINE SYB4T4 (NIR,JMINRA,XCOTEA,SINPHI,DCOTEB,COSPHI,ORIGIN,
+     & PENTES,ANGLES,IXRAYO,DELTAH,DXMIN,DELTAC)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Compute the position of the next track intersecting with side 4 in a
+* sectorized Cartesian cell.
+*
+*Copyright:
+* Copyright (C) 2002 Ecole Polytechnique de Montreal
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation; either
+* version 2.1 of the License, or (at your option) any later version
+*
+*Author(s): A. Hebert
+*
+*Parameters: input
+* NIR     number of radius.
+* JMINRA  index of the first radius intercepting the side.
+* XCOTEA  radius interceptions.
+* SINPHI  sinus.
+* DCOTEB  half-side of the rectangle (center-side position).
+* COSPHI  cosinus.
+* ORIGIN  origin of the track.
+* PENTES  slope of the track.
+* ANGLES  slope of the sector.
+* IXRAYO  index of the radius.
+* DELTAH  position of the corner.
+* DXMIN   accuracy.
+*
+*Parameters: output
+* DELTAC  position of the next trajectory.
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER NIR,JMINRA,IXRAYO
+      REAL    XCOTEA(JMINRA:NIR),SINPHI,DCOTEB,COSPHI,ORIGIN,PENTES,
+     &        ANGLES,DELTAH,DXMIN,DELTAC
+*
+* Rayon Exterieur Suivant
+      IF (JMINRA .LE. NIR) THEN
+      IF (IXRAYO .LE. NIR) THEN
+        Y = XCOTEA(IXRAYO)
+        D = Y * SINPHI - DCOTEB * COSPHI
+        DELTAC = MIN(DELTAC, D)
+      ENDIF
+      ENDIF
+*
+* Secteur Suivant
+      DA = ANGLES - PENTES
+      IF (ABS(DA) .GT. DXMIN) THEN
+        D = ORIGIN / DA
+        DELTAC = MIN(DELTAC, D)
+      ENDIF
+*
+* Coin Sud-West
+      DELTAC = MIN(DELTAC, DELTAH)
+*
+      RETURN
+      END