Update README.md

Molecolab-Pisa · Feb 27, 2023 · e9a1ee9 · e9a1ee9
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@@ -29,7 +29,7 @@ both algorithms require two user-provided routines to apply the matrx
 and a suitable preconditioner to a set of vectors.
 such routines have the following interface:
 
-  subroutine matvec(n,m,x,ax)
+  subroutine matvec(n,m,x,ax)  
   subroutine precnd(n,m,shift,x,ax)
 
 where n,m are integers and x(n,m) and ax(n,m) are double precision