why beam value 10000?

[Arraxx]

1. In this Phoneticize function why the argument beam was passed as 10000? I want to use beam value 1000 as it is helping me to reduce the time to generate the corresponding phoneme for longer graphemes. But there is reduced number of n_best candidates for my grapheme data. How to maintain that while still using beam_value as 1000?
   By decreasing beam value by a factor of 10 I see the evaluation time also decrease by 10 but it also decrease the number of n_best candidates. Please help here.
2. What is the threshold and pmass meaning here?

(

Phonetisaurus/src/include/PhonetisaurusScript.h

Lines 107 to 111 in f08d3df

	vector<PathData> Phoneticize (const string& word, int nbest = 1,
	int beam = 10000, float threshold = 99,
	bool write_fsts = false,
	bool accumulate = false,
	double pmass = 99.0) {

)

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