Tab-separate data section of summary files.

* pyhegp/serialization.py (read_summary, write_summary): Use tab as
the delimiter.
* doc/file-formats.md (File formats)[summary file]: Update
documentation.

1 files changed, 1 insertions, 1 deletions

diff --git a/doc/file-formats.md b/doc/file-formats.md
index 27dfe2a..4d3bfcd 100644
--- a/doc/file-formats.md
+++ b/doc/file-formats.md
@@ -5,7 +5,7 @@ The summary file is ASCII encoded. It consists of two sections—the header and
 
 The first line of the header section MUST be `# pyhegp summary file version 1`. Subsequent lines of the header section are a list of key-value pairs. Each line MUST be `#`, optional whitespace, the key, a single space character and then the value. The key MUST NOT contain whitespace or control characters, and MUST NOT begin with a `#` character. The value MAY contain whitespace characters, but MUST NOT contain control characters.
 
-The data section is a space separated table of numbers. The first line of the data section is a vector of means—one for each SNP. The second line is a vector of standard deviations—one for each SNP.
+The data section is a tab-separated table of numbers. The first line of the data section is a vector of means—one for each SNP. The second line is a vector of standard deviations—one for each SNP.
 
 Here is an example summary file.
 `TODO: Add example.`