diff --git a/prep_flexpart/mod_prep_command.f90 b/prep_flexpart/mod_prep_command.f90
index 7020fc5fa6f8445c6027b170aa906bb2e9f27015..52451e899bc9e8fe09590ed882502cf1d4c78680 100644
--- a/prep_flexpart/mod_prep_command.f90
+++ b/prep_flexpart/mod_prep_command.f90
@@ -183,7 +183,7 @@ module mod_prep_command
       lturbulence = 1
       lturbulence_meso = 0
       lnetcdfout = 0
-      nxshift = 1
+      nxshift = 0
       maxthreadgrid = 1
       maxfilesize = 10000
       logvertinterp = 0
diff --git a/prep_flexpart/prep_outgrid.f90 b/prep_flexpart/prep_outgrid.f90
index 8d55f9f8bf6199dd8e07c28cd36a39470670038d..4be6291e1e7fdea36680dcbd875888d69c4784ee 100644
--- a/prep_flexpart/prep_outgrid.f90
+++ b/prep_flexpart/prep_outgrid.f90
@@ -84,7 +84,7 @@ subroutine prep_outgrid(settings, jd, nr)
     if ( settings%windfield.eq.'oper' ) then
       outlon0 = -179.
     else if ( settings%windfield.eq.'era5' ) then
-      outlon0 = -179.
+      outlon0 = -179.5
     else
       write(*,*) 'ERROR: prep_outgrid: unknown windfield type'
       stop
diff --git a/prep_flexpart/prep_releases.f90 b/prep_flexpart/prep_releases.f90
index 2dd83d173d853b9f1f79cf8ddc0fa862e296f19a..2cd520c7f26a4f129c08d6c5b29d734f532245cc 100644
--- a/prep_flexpart/prep_releases.f90
+++ b/prep_flexpart/prep_releases.f90
@@ -121,7 +121,7 @@ subroutine prep_releases(settings, jd, nr, nobs, obs)
   if ( settings%FPversion.eq.10 ) then
     inquire(file=trim(settings%path_flexpart)//'options/SPECIES/spec_overview',exist=lexist)
     if ( .not.lexist ) then
-      write(*,*) 'ERROR: cannot find file /options/SPECIES/spec_overview'
+      write(*,*) 'ERROR: cannot find file '//trim(settings%path_flexpart)//'options/SPECIES/spec_overview'
       stop
     endif
     open(100,file=trim(settings%path_flexpart)//'options/SPECIES/spec_overview',status='old',action='read',iostat=ierr)
@@ -138,29 +138,32 @@ subroutine prep_releases(settings, jd, nr, nobs, obs)
     inquire(file=trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species)),&
             exist=lexist)
     if ( .not.lexist ) then
-      write(*,*) 'ERROR: cannot find file /options/SPECIES/SPECIES_'//to_upper(trim(settings%species))
+      write(*,*) 'ERROR: cannot find file '&
+                 //trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species))
       stop
     endif
     write(aspec,fmt='(I3.3)') spec    
     call system('cp '//trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species))//&
                 ' '//trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//aspec)
     write(aspec,fmt='(I3.3)') spec    
-    ! read SPECIES file for reagents info
-    allocate(preactions(nreagent))
-    allocate(pcconst(nreagent))
-    allocate(pdconst(nreagent))
-    allocate(pnconst(nreagent))
-    open(100,file=trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species)),&
-          action='read',iostat=ierr)
-    read(100,species_params,iostat=ierr)
-    if ( ierr.ne.0 ) then
-      write(*,*) 'ERROR: reading SPECIES_'//to_upper(trim(settings%species))
-      stop
-    endif
-    write(*,*) 'Chemical reactions: ',preactions
-    if (any(preactions.ne."")) then
-      ! write reagents file
-      call prep_reagents(settings,preactions,nr,jd)
+    if (nreagent.gt.0) then
+      ! read SPECIES file for reagents info
+      allocate(preactions(nreagent))
+      allocate(pcconst(nreagent))
+      allocate(pdconst(nreagent))
+      allocate(pnconst(nreagent))
+      open(100,file=trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species)),&
+            action='read',iostat=ierr)
+      read(100,species_params,iostat=ierr)
+      if ( ierr.ne.0 ) then
+        write(*,*) 'ERROR: reading SPECIES_'//to_upper(trim(settings%species))
+        stop
+      endif
+      write(*,*) 'Chemical reactions: ',preactions
+      if (any(preactions.ne."")) then
+        ! write reagents file
+        call prep_reagents(settings,preactions,nr,jd)
+      endif
     endif
   endif
 
diff --git a/prep_flexpart/prep_releases_reg.f90 b/prep_flexpart/prep_releases_reg.f90
index 1b2f182476535e30bf646a6c5bd507512f88858d..87b7b4e935d97bb6c8a49f7f9c2bb9c8ef3992a4 100644
--- a/prep_flexpart/prep_releases_reg.f90
+++ b/prep_flexpart/prep_releases_reg.f90
@@ -130,7 +130,7 @@ subroutine prep_releases_reg(settings, jd, nr)
   if ( settings%FPversion.eq.10 ) then
     inquire(file=trim(settings%path_flexpart)//'options/SPECIES/spec_overview',exist=lexist)
     if ( .not.lexist ) then
-      write(*,*) 'ERROR: cannot fine file /options/SPECIES/spec_overview'
+      write(*,*) 'ERROR: cannot find file '//trim(settings%path_flexpart)//'options/SPECIES/spec_overview'
       stop
     endif
     open(100,file=trim(settings%path_flexpart)//'options/SPECIES/spec_overview',status='old',action='read',iostat=ierr)
@@ -147,29 +147,32 @@ subroutine prep_releases_reg(settings, jd, nr)
     inquire(file=trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species)),&
             exist=lexist)
     if ( .not.lexist ) then
-      write(*,*) 'ERROR: cannot find file /options/SPECIES/SPECIES_'//to_upper(trim(settings%species))
+      write(*,*) 'ERROR: cannot find file '&
+                 //trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species))
       stop
     endif
     write(aspec,fmt='(I3.3)') spec
     call system('cp '//trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species))//&
                 ' '//trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//aspec)
     write(aspec,fmt='(I3.3)') spec
-    ! read SPECIES file for reagents info
-    allocate(preactions(nreagent))
-    allocate(pcconst(nreagent))
-    allocate(pdconst(nreagent))
-    allocate(pnconst(nreagent))
-    open(100,file=trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species)),&
-          action='read',iostat=ierr)
-    read(100,species_params,iostat=ierr)
-    if ( ierr.ne.0 ) then
-      write(*,*) 'ERROR: reading SPECIES_'//to_upper(trim(settings%species))
-      stop
-    endif
-    write(*,*) 'Chemical reactions: ',preactions
-    if (any(preactions.ne."")) then
-      ! write reagents file
-      call prep_reagents(settings,preactions,nr,jd)
+    if (nreagent.gt.0) then
+      ! read SPECIES file for reagents info
+      allocate(preactions(nreagent))
+      allocate(pcconst(nreagent))
+      allocate(pdconst(nreagent))
+      allocate(pnconst(nreagent))
+      open(100,file=trim(settings%path_flexpart)//'options/SPECIES/SPECIES_'//to_upper(trim(settings%species)),&
+            action='read',iostat=ierr)
+      read(100,species_params,iostat=ierr)
+      if ( ierr.ne.0 ) then
+        write(*,*) 'ERROR: reading SPECIES_'//to_upper(trim(settings%species))
+        stop
+      endif
+      write(*,*) 'Chemical reactions: ',preactions
+      if (any(preactions.ne."")) then
+        ! write reagents file
+        call prep_reagents(settings,preactions,nr,jd)
+      endif
     endif
   endif