diff --git a/.gitignore b/.gitignore
index 18845a5f..ca0c8d93 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,9 @@
 *.outs
 *.log
 *.dat
+*.tree
+*.info
+*.vtu
 *.eps
 *.png
 *.avi
diff --git a/Manifest.toml b/Manifest.toml
index 60e01a81..7e068dcc 100644
--- a/Manifest.toml
+++ b/Manifest.toml
@@ -39,9 +39,10 @@ deps = ["Markdown"]
 uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 
 [[JLLWrappers]]
-git-tree-sha1 = "a431f5f2ca3f4feef3bd7a5e94b8b8d4f2f647a0"
+deps = ["Preferences"]
+git-tree-sha1 = "642a199af8b68253517b80bd3bfd17eb4e84df6e"
 uuid = "692b3bcd-3c85-4b1f-b108-f13ce0eb3210"
-version = "1.2.0"
+version = "1.3.0"
 
 [[LibCURL]]
 deps = ["LibCURL_jll", "MozillaCACerts_jll"]
@@ -99,6 +100,12 @@ uuid = "ca575930-c2e3-43a9-ace4-1e988b2c1908"
 deps = ["Artifacts", "Dates", "Downloads", "LibGit2", "Libdl", "Logging", "Markdown", "Printf", "REPL", "Random", "SHA", "Serialization", "TOML", "Tar", "UUIDs", "p7zip_jll"]
 uuid = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 
+[[Preferences]]
+deps = ["TOML"]
+git-tree-sha1 = "ea79e4c9077208cd3bc5d29631a26bc0cff78902"
+uuid = "21216c6a-2e73-6563-6e65-726566657250"
+version = "1.2.1"
+
 [[Printf]]
 deps = ["Unicode"]
 uuid = "de0858da-6303-5e67-8744-51eddeeeb8d7"
@@ -151,9 +158,9 @@ uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
 [[WriteVTK]]
 deps = ["Base64", "CodecZlib", "FillArrays", "LightXML", "Random", "TranscodingStreams"]
-git-tree-sha1 = "37eef911a9c5211e0ae4362dc0477cfe6c537ffa"
+git-tree-sha1 = "2d559f58ff021c0f0f3d2394d2688a84a84257aa"
 uuid = "64499a7a-5c06-52f2-abe2-ccb03c286192"
-version = "1.9.1"
+version = "1.9.2"
 
 [[XML2_jll]]
 deps = ["Artifacts", "JLLWrappers", "Libdl", "Libiconv_jll", "Pkg", "Zlib_jll"]
diff --git a/Project.toml b/Project.toml
index 8f576e0f..00e80c79 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Batsrus"
 uuid = "e74ebddf-6ac1-4047-a0e5-c32c99e57753"
 authors = ["Hongyang Zhou <hyzhou@umich.edu>"]
-version = "0.2.6"
+version = "0.2.7"
 
 [deps]
 FortranFiles = "c58ffaec-ab22-586d-bfc5-781a99fd0b10"
diff --git a/src/io.jl b/src/io.jl
index 837fe945..a1dd96b1 100644
--- a/src/io.jl
+++ b/src/io.jl
@@ -8,10 +8,16 @@ searchdir(path,key) = filter(x->occursin(key,x), readdir(path))
 
 function Base.show(io::IO, s::Data)
    showhead(s)
-   println(io, "filesize = ", s.list.bytes, " bytes")
-   println(io, "snapshots = ", s.list.npictinfiles)
-   println(io, "x = ", s.x)
-   println(io, "w = ", s.w)
+   if s.list.bytes ≥ 1e9
+      @info "filesize = $(s.list.bytes/1e9) GB"
+   elseif s.list.bytes ≥ 1e6
+      @info "filesize = $(s.list.bytes/1e6) MB"
+   elseif s.list.bytes ≥ 1e3
+      @info "filesize = $(s.list.bytes/1e3) KB"
+   else
+      @info "filesize = $(s.list.bytes) bytes"
+   end
+   @info "snapshots = $(s.list.npictinfiles)"
 end
 
 """
@@ -335,9 +341,9 @@ function getfilehead(fileID::IOStream, type::String)
          eqpar = parse.(Float64, split(readline(fileID)))
       end
       varname = readline(fileID)
-   elseif ftype ∈ ["real4","binary"]
+   elseif ftype ∈ ["real4", "binary"]
       skip(fileID, tag) # skip record start tag.
-      headline = String(read(fileID, lenstr))
+      headline = rstrip(String(read(fileID, lenstr)))
       skip(fileID, 2*tag) # skip record end/start tags.
       it = read(fileID, Int32)
       t = read(fileID, Float32)