--- a/scripts/plot/__plt1__.m
+++ b/scripts/plot/__plt1__.m
@@ -23,26 +23,18 @@
 
 ## Author: jwe
 
-function __plt1__ (h, x1, fmt, key)
+function __plt1__ (h, x1, options)
 
-  if (nargin < 2 || nargin > 4)
+  if (nargin < 2 || nargin > 3)
     print_usage ();
   endif
 
-  if (nargin < 3 || isempty (fmt))
-    fmt = {""};
+  if (nargin < 3 || isempty (options))
+    options = __default_plot_options__ ();
   endif
 
-  if (nargin < 4 || isempty (key))
-    key = {""};
-  endif
-
-  if (! iscellstr (fmt))
-    error ("__plt1__: fmt must be a cell array of character strings");
-  endif
-
-  if (! iscell (key))
-    error ("__plt1__: fmt must be a cell array");
+  if (! isstruct (options))
+    error ("__plt1__: options must be a struct array");
   endif
 
   [nr, nc] = size (x1);
@@ -61,6 +53,6 @@
     x1 = (1:nr)';
   endif
 
-  __plt2__ (h, x1, x2, fmt, key);
+  __plt2__ (h, x1, x2, options);
 
 endfunction