diff --git a/src/args.jl b/src/args.jl
index 7466dce9..19b4af21 100644
--- a/src/args.jl
+++ b/src/args.jl
@@ -1238,6 +1238,7 @@ convertLegendValue(v::AbstractArray) = map(convertLegendValue, v)
 # 1-row matrices will give an element
 # multi-row matrices will give a column
 # InputWrapper just gives the contents
+# AbstractRange gives (first, last) tuple
 # anything else is returned as-is
 function slice_arg(v::AMat, idx::Int)
     c = mod1(idx, size(v,2))
@@ -1245,6 +1246,7 @@ function slice_arg(v::AMat, idx::Int)
     size(v,1) == 1 ? v[first(m),n[c]] : v[:,n[c]]
 end
 slice_arg(wrapper::InputWrapper, idx) = wrapper.obj
+slice_arg(v::AbstractRange, idx) = (first(v), last(v))
 slice_arg(v, idx) = v