diff --git a/src/enmap.jl b/src/enmap.jl
index fac6c91..7b3fdcc 100644
--- a/src/enmap.jl
+++ b/src/enmap.jl
@@ -54,6 +54,20 @@ function Base.convert(::Type{CarClenshawCurtis{T}}, w0::WCSTransform) where T
     return CarClenshawCurtis{T}(T.(getcdelt(w0)), T.(getcrpix(w0)), T.(getcrval(w0)), getunit(T, w0))
 end
 
+# this kind of WCS only has two spatial dimensions. this check should be constant-propagated
+function Base.getproperty(wcs::CarClenshawCurtis, k::Symbol)
+    if k == :naxis
+        return 2
+    end
+    return getfield(wcs, k)
+end
+
+function Base.show(io::IO, wcs::CarClenshawCurtis{T}) where T
+    expr = join(["$k=$(getproperty(wcs, Symbol(k)))"
+                 for k in ["naxis","cdelt","crval","crpix"]], ",")
+    print(io, "CarClenshawCurtis{$(T)}($expr)")
+end
+
 
 # forward all array traits to parent. based on MetaArrays
 Base.size(x::Enmap) = size(parent(x))
diff --git a/test/test_io.jl b/test/test_io.jl
index ab78714..a3c5505 100644
--- a/test/test_io.jl
+++ b/test/test_io.jl
@@ -1,16 +1,16 @@
 
 
 @testset "Enmap I/O" begin
-    imap = read_map("data/test.fits"; trim=false)
-    @test size(imap) == (100, 100, 3)
-    @test imap.wcs.naxis == 2
-    @test imap.wcs.cdelt == [-1, 1]
-    @test imap.wcs.crval == [0.5, 0.0]
-    @test sum(imap) ≈ 14967.2985
-    # read with sel
-    imap = read_map("data/test.fits", sel=(11:20,21:40,1:2); trim=false)
-    @test size(imap) == (10,20,2)
-    imap = read_map("data/test.fits", sel=(11:20,21:40,1:2); trim=true)
-    @test size(imap) == (10,20,2)
+    for trim in (true, false)
+        imap = read_map("data/test.fits"; trim=trim)
+        @test size(imap) == (100, 100, 3)
+        @test imap.wcs.naxis == 2
+        @test collect(imap.wcs.cdelt) == [-1, 1]
+        @test collect(imap.wcs.crval) == [0.5, 0.0]
+        @test sum(imap) ≈ 14967.2985
+        # read with sel
+        imap = read_map("data/test.fits", sel=(11:20,21:40,1:2); trim=trim)
+        @test size(imap) == (10,20,2)
+    end
     # todo: add tests on IAU conversion w/ and w/o sel
 end